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Pestonya is a maid whose outer appearance is that of a beautiful lady but has the head of a Shetland Sheepdog instead of a human's and a vertical scar on her face running down the center with signs of stitching.
Pestonya is a benevolent person who's loyal to Nazarick. Despite her gruesome appearance, Pestonya is a motherly figure and one of the few in Nazarick who does not despise humans. She, alongside Nigredo, does not agree to kill innocent people.
In the Web Novel, Pestonya's creator was a person that mostly named things based on food and tried to name her Pescatore. Later it's revealed that she has the same creator as Eclair Ecleir Eicler thus making her a creation of Ankoro Mocchi Mochi.
The Dark Warrior Arc
- Main article: The Dark Warrior Arc
The Lizard Man Heroes Arc
- Main article: The Lizard Man Heroes Arc
Pestonya serves Aura with a hamburger with two pickles, french fries with skin on, and a cola drink during her break time.  During the war with the lizardmen, she assists Shalltear Bloodfallen by supplementing her magic to open a Gate to the Wetlands when Shalltear claims that she is not able to do so alone.
The Men in the Kingdom Arc
- Main article: The Men in the Kingdom Arc
In response to Sebas Tian's order, Solution Epsilon reluctantly declined using the scrolls created by the Supreme Beings. Instead, she makes a suggestion to Sebas about requesting help from Pestonya, since she has the power to heal Tuareninya Veyron's wounds.
Once Tuare is accepted into Nazarick by Ainz, Pestonya along with the other homunculus maids would later greet her. After Tuare leaves, Pestonya makes a quip at Sebas that the human has fallen for him, causing the butler to blush upon hearing those words from her.
The Invaders of the Large Tomb Arc
- Main article: The Invaders of the Large Tomb Arc
Ainz decides to give rewards to his minions for their hard work. When Solution asks for a few humans, Ainz reminisces about the humans held captive from the Eight Fingers and the remaining humans protected by Pestonya and Nigredo who are both under confinement. He decides to give Solution the remaining captives of Eight Fingers and not the latter because Pestonya and Nigredo actually risked going against his orders to save them. As a result, Albedo is outraged and while Ainz forgives them, they are sentenced to house arrest until Albedo has a chance to calm down.
The Pleiades Day Arc
- Main article: The Pleiades Day Arc
Due to her actions, Pestonya was confined in the Frozen Prison with Nigredo as her cellmate. Because of her confinement, she was unable to complete Tuare's maid training, a task that was later taken over by Yuri Alpha. She and her compatriot were later freed at the behest of Yuri, who requested their aid in running a Sorcerer Kingdom sponsored orphanage.
The Ruler of Conspiracy Arc
- Main article: The Ruler of Conspiracy Arc
Both Nigredo and her are released from confinement and are later put in charge of managing a new war orphanage in E-Rantel in order to help with integrating future generations to stay loyal to Nazarick.
The Witch of the Falling Kingdom Arc
- Main article: The Witch of the Falling Kingdom Arc
A month after the Sorcerer Kingdom declared war on the Re-Estize Kingdom, Pestonya was present in Ainz Ooal Gown's study along with the regular maids and the Floor Guardians. They listened to the report of Cocytus's exploits in destroying a city of the Kingdom.
At some point before Ainz make his return back to Nazarick, Pestonya had requested her colleague Sebas to speak on her behest with their master which the butler obliged to do, considering she doesn't have permission to leave the area she was at. She and Nigredo want Ainz to visit the Frozen Prison alone with the exception of Sebas. Pestonya was scheduled to arrive at the Frozen Prison an hour later there first before the two after her master is done with his war meeting with the Floor Guardians on the Re-Estize Kingdom. Sebas told Ainz he will give the order to Pestonya on taking care of that doll matter his master spoke of.
An hour later, Pestonya went to the Frozen Prison to have a private meeting she and Nigredo have had arranged with Ainz alongside the butler Sebas present there. Once they are present, both she and Nigredo argue their cases to Ainz on why a massacre of the Re-Estize Kingdom should be avoided. Ainz however is adamant that the cull is necessary for the sake of strengthening the Sorcerer Kingdom and to ensure that human civilization never becomes too strong.
Upon stating his different reasons for rejecting their suggestions, Ainz asked whether this finally marks the end of their discussion, Pestonya was the first to refuse as she states that it was not over yet. Pestonya then brought up the idea of letting humans become fearmongers by sparing some alive and have them be used for spreading the news of opposing the Sorcerer Kingdom as hopeless. Ainz considered her suggestion thoughtfully and decided to allow only 90% of the Re-Estize Kingdom's people to be wipe out while the rest will be allowed to live on. After Ainz decides to take her idea into consideration, she alongside Nigredo voice how eternally grateful they are to their master hearing them out.
Later on, Pestonya would help Renner resurrect Climb back to life with her magic. After reviving him, she immediately exited the room to leave Renner alone with Climb for the time being.
The Dinner Is All Nazarick Members Arc
- Main article: The Dinner Is All Nazarick Members Arc
Pestonya attended a lavish meal prepared by the Head Chef. However when Eclair toasted to himself, she gave him a cold stare. Much to his distress, the Head Chef had an idea to use penguins in his cooking, and wondered if he could use the Albino Penguins found on the 5th Floor. The Head Maid honestly felt that it would be impossible to do, earning her ire from Eclair as that wasn’t the issue she should be focusing on.
|NOTICE: The following section and subsequent subsections are considered NON-CANON to the Overlord Light Novels.|
Mass for the Dead Arc
- Main article: Mass for the Dead Arc
Pestonya was among the NPCs that were killed during the transfer of Nazarick to the New World. The Head Maid was eventually revived as around the time before of after Neuronist Painkill's own revival. Pestonya would assign Fiore to assist Aura and Mare on the 6th Floor with their pumpkin patch. After the conclusion of the vent known as the Nazarick Fighting Tournament, Pestonya had to deal with assigning Corpse Guardian a new task. 
The Head Maid would be called on to attend some guest in Nazarick that emerged from the Crack. When one of their visitors, a maid, insisted that they clean their own room by themselves, a dispute occurred between the general maids and guests. It was eventually resolved by Pestonya who turned them to focus their energies on a contest to determine who could clean the room more efficiently.
Pestonya would have another opportunity to entertain another set of visitors from another world. This time she asked their help in assisting the Head Chef create the perfect Kinako Bread. When the 9th Floor started conducting evacuation drills, Pestonya helped to organize the general maids to prepare for the training exercise. Her name was brought up by Sebas Tian while undercover in E-Rantel, musing how he is like the head maid in being unable to ignore Tuare's suffering.
Her healing expertise were later called after the leader of an new group of otherworld visitors came and helped to kill the Grim Reaper, though she had to work with Sebas Tian and Lupusregina due to the severity of the injuries their patient had. She did again for a new group of visitors came through the Crack and helped Nazarick's temporary guests overcome growing pains using her magic.
Pestonya participate in some Nazarick events like the Miyoshi-kin Cup / Mixed Bathing Washing Party, acting as a guide to contestants for the third competition.  And help to prepare food for a second Christmas party in Nazarick.
At a tea party on the 6th Floor with Yuri and Aura she offered the latter to try some of chocolate that they were making in preparation for Project: Valentine. She informed the maid and Floor Guardian that a tasting party would be hosted to make chocolate fit for New World inhabitants. When the two expressed interest in participating Pestonya encouraged them and even provided costumes for the occasion.
The Head Maid would help coordinate the Idol Plan by informing the general maids of its launch and would attend the idol events to not just supervise the venues but also enjoy the show by LittleMass.  She continued to do this alongside Sebas Tian. At the last show for LittleMass taking place in the Amphitheater she expressed her shock to see that the Corpse Guardian was selected to be the last opponent for the idols.
At the time of the "Nzarick Swimsuit Athletic Meet", Pestonya supervised the general maids gathering in the canteen for the event. She urged her charges to enjoy themselves and follow the instructions at the start of the proceedings. Unlike the other maids who rooted for different teams competing, the Head Maid kept neutral and cheered on both teams.
When Albedo began to organize a formal Halloween Festival in Nazarick, Pestonya came by at the canteen to chat with Foire, Cixous, CZ and Lupusregina on the upcoming festivities. The Head Maid was especially happy to see Foire in good spirits considering her trauma from the last Halloween event. She and the general maids volunteered to help prepare for Halloween by taste testing the new chocolates by the Head Chef. Later the role was expanded by Albedo, Slimeko and the protagonist to help create a new type of cheap, easy to produce chocolates for the citizens of E-Rantel who developed a craving for the confections since the items were revealed at the adventurer exhibition. As a part of the Halloween Festival, Pestonya took part in the "Defense Training" part of the festivities to conduct an evacuation drill on the 9th Floor. The maid and others guarding the 9th Floor headed to the nearby panic room. After the events played out, Pestonya celebrate Halloween at the pumpkin patch on the 6th Floor with the others.
A new group of visitors from another arrived in Nazarick, a trio of magical girls, Pestonya was assigned to assist with her healing magic for one of the girls due to her debilitating health.
For the Sorcerer Kingdom’s National Foundation Day Ceremony, Pestonya was charged by Sebas Tian to speak with the chefs to prepare a appropriate feast for the venue.  Pestonya assisted the general maids and Sebas Tian in setting up the appropriate accommodations for the guests. She was present in the Throne Room of Fake Nazarick at the start of the ceremony. In the banquet portion of event, Pestonya acted as hostess to the lizardmen representatives, displaying the thousand kinds of meat they could sample and offered them to try a fine bottle of alcohol selected by Sous-chef. Later at the end of the party, she admired the newly unveiled Sorcerer King Momonga Statue.
At the inception of the revival of LittleMass and its transformation into LittleMasStar to commemorate Neutrally’s inclusion into the idol group, Pestonya and Sebas Tian supervised the general maids while they experienced the three live idols shows held in Nazarick. 
Pestonya's services would be called again by Solution to help treat a returning guest from another world. However the scene turning confusing when she, Solution and Shalltear witnessed Albedo assault the injured guest. Initially horrified that the Overseer Guardian would have the gall to attack one of their master's guests, she soon came to understand Albedo's actions were justified as the guest climbed to his feet without any apparent injuries. The Head Maid saw a fight break out between members of Nazarick and the guest, who escaped by turning several members of the 9th Floor into doppelgängers of himself. The Head Maid would later heal the escapee after Pandora's Actor helped the youth in expending all his spiritual energy that was plaguing him and causing the behavioral change.
Abilities and Powers
Pestonya is a High Priest that can use powerful healing magic. She is also said to be a high-leveled cleric. Her maid outfit is equal to a high-class item, bringing her some defensive stats. In addition, her fur possesses cold resistance. If Pestonya decided to use resurrection spells, then she would require the use of gold coins, jewels, or other valuable goods equivalent to it in exchange.
In the Web Novel, it was said that she has access to the highest-ranking of holy magic. According to Ainz, she was considered to be the best healer they can find available in the Great Tomb of Nazarick. She can also transfer her mana reserves over to Shalltear, helping to prolong the vampire's use of the [Gate] spell. The butler Sebas Tian recalls that there are only two people in Nazarick who could completely remove Tuareninya Veyron's mental damage were Pestonya as well as Ainz.
According to the author, Pestonya is a heteromorph with the ability to transform like The Thing from the 1982 John Carpenter movie. However that form was deleted by her creator.
Like all the other NPC's of the Great Tomb of Nazarick, Pestonya is eternally loyal and devoted to its master and final Supreme Being, Ainz. She would follow his orders and accomplish her tasks with the very best of her abilities and powers in order to meet his expectations.
Ainz in turn reciprocates this loyalty by being thoughtful and considerate to Pestonya, as seen where he had no negative feelings to her freeing the captured humans acquired from the Re-Estize Kingdom. He even chose not to have her executed despite the other NPC's opinions on the matter. And later during the Fall of the Re-Estize Kingdom, Ainz placed genuine thought on Pestonya's pleading to spare some of the humans of the kingdom. He promised to somehow follow through in her request, as seen where he had the Royal Capital's children and some of its citizens evacuated before the final siege and left the inhabitants of E-Naeurl alive. This compassion in turn has caused Pestonya to feel even more loyal to him due to his kindness.
Pestonya is the personal creation of Ankoro Mocchi Mochi and as such, out of the Forty-One Supreme Beings, she feels the most loyalty, reverence, and respect for her the most similar to her fellow NPC's and reserves her loyalty to her first and foremost.
Pestonya in particular was noted by Ainz to have successfully inherited some of her creators personality traits to remind him of her.
Unlike the rest of the denizens of Nazarick, she and Nigredo opposed killing innocent people kidnapped by Demiurge from Re-Estize. They went out of their way to free them and ended up being punished for it.
They were once imprisoned together as cell-mates before later being released in order to run the new Sorcerer Kingdom Orphanage by Ainz. Pestonya and Nigredo were noted to have become very close to each other due to their similar mindsets and time together and their new assignment which has them now working even closer as coworkers under the same job.
Pestonya is close enough to Aura to the point they refer to each other with nicknames outside of work. That is because the Supreme Beings who had made them were close to each other, and they felt similarly close to each other. She is even willing to help bring food such as hamburgers to Aura when the elf decided to take a break from work.
Pestonya is close enough to Mare to the point they refer to each other with nicknames outside of work. That is because the Supreme Beings who had made them were close to each other, and they felt similarly close to each other.
Pestonya seems to be in friendly terms with Yuri to the point where they openly refer to each other with nicknames outside of work. That is because the Supreme Beings who had made them were close friends and are friendly to one another. Based on the closeness of their respective creator's relationship, it mirrors the relationship Pestonya had with Yuri as their creations.
Pestonya is close enough to Eclair to the point they refer to each other with nicknames outside of work. That is because they've been created by the same Supreme Being and therefore similar to the other NPC's, Pestonya feels a familial bond with him.
Pestonya greeted Tuare and welcomed her as the newest maid in the Great Tomb of Nazarick. She agreed with Sebas Tian to educate her on how to become a proper maid. Pestonya also noticed that Tuare had fallen for Sebas Tian and she used that fact to tease him despite him being her superior.
Sebas and Pestonya are shown to possess a positive superior-subordinate relationship as Head Butler and Head Maid of the Great Tomb Of Nazarick and shown to have a close friendship with each other.
This is seen where Pestonya is shown to be close enough to Sebas to casually talk to him and tease him about his relationship with Tsuare and make friendly teasing jokes about their future marriage together. Later it was shown that due to their similar kind hearted mind-sets and positive opinion on humanity Sebas supports Pestonya in her pleadings to spare some of the innocent human civilians during the Fall of the Re-Estize Kingdom to their Master.
- Pestonya was designed to have a speaking habit of adding a "woof" sound whenever finishing a statement but she occasionally forgets or adds it a little too late.
- In the Web Novel, the three elven slaves from Tenmu had their ears fully restored by Pestonya's magic.
- According to Maruyama, alongside Pandora's Actor, Pestonya can use resurrection magic almost infinitely.
- This is accomplished by having Pandora's Actor using his shape-shifting skills as a Greater Doppelgänger to transform into his Momonga Form, which possesses an absurd Mana pool that Pestonya can then siphon Mana from in order to use Resurrection magic indefinitely.
- (To Aura): "As per Aura-sama's wishes, I have brought a hamburger as well as two pickles, french fries with skin on and the drink would be cola Woof."
- (To Sebas about Tuare): "...wan. That is to say, I meant she would probably retire after marriage-wan."
- (To Ainz): "I sincerely apologize for this ~wan. While I do agree with what you have said, we have calculated that this amount of people will be needed to provide the optimum assistance for your three days of vacation ~wan. If you wish to roll around in your room! then I feel we must ensure you move around in perfect comfort ~wan."
- (To Ainz): "For instance, if you wish to roll on your back, we will have eight maids to turn you ~wan. In addition, if you wish to read a book, we will have one person hold the book while another watches where you look and turns the page ~wan."
- (To Ainz): "By what grace may they be spared if it is not by mercy alone? Woof."
- (To Ainz): "Yes — Ainz-sama. I heard that your strategy this time around was called Candy and Whip, to let the countries around us know the difference in outcome between the Empire who chose to become our vassal and the Kingdom who chose to oppose us as enemies. Was that the reason for the current massacre, woof?"
- (To Ainz): "As more and more people manage to escape through great tribulations, wouldn't the perception of how foolish it is to disobey Ainz-sama, or rather the Sorcerer Kingdom, become more widespread? Uh, woof."
- (To Ainz): "So some people chosen to be spared will live under the Nazarick's rule, woof. I don't believe that would advertise the message louder than if we were to let the unchosen ones escape."