Tira

Tira (ティラ) is the triplet sister of Tia and Tina, and the leader of the Assassin group Ijaniya, which is currently under the control of the Sorcerer Kingdom.

Appearance
Being triplets with Tia and Tina, it can be assumed that Tira looks almost identical to her sisters, having blonde hair and coral eyes.

Personality
Trained as a assassin, it can be assumed that Tira can be cold-blooded, professionally ruthless and has little to no remorse for those she kills. It can also be assumed that, unlike Tia and Tina, Tira was loyal to Ijaniya, as she remained with the group after both of her sisters defected. She eventually made her way up to becoming the organization's leader, showing some level of intelligence, pragmatism, determination, cunning and charisma.

Background
Tira, alongside her triplet sisters Tia and Tina, grew up as part of Ijaniya, an assassin organization of some renown within the northeastern corner of the Baharuth Empire, to inherit their ways and trained their skills to perfection. However, her sisters went on a mission to assassinate adamantite-rank adventurer, Lakyus Alvein Dale Aindra, and never returned. They instead ended up joining the latter's adventurer group, Blue Roses. Tira, on the other hand, stayed with Ijaniya and rose through its ranks, and eventually made her way up to becoming the leader of the organization.

The Bloody Valkyrie Arc
This character was briefly mentioned by Brain Unglaus when his comrades in Death Spreading Brigade alerted everyone in their base of an attack by a young woman. His mind then went to women who had the power to do this much damage to their men. One of them was a woman who was said to be the strongest assassin in the Empire.

The Ruler of Conspiracy Arc
The assassin was mentioned by Osk, who believed that only the heiress of Ijaniya could match up to the Headhunter Rabbit's skills.

The Witch of the Falling Kingdom Arc
While discussing the current state of the Sorcerer Kingdom, Ainz Ooal Gown mentions Tira is focusing on training a group of human agents and spies for him with the assistance of several Hanzos. Tira was also noted to make use of the Hanzos as suitable training partners in order to advance her own skills as an assassin.

Abilities and Powers
As the leader of the famous assassination group Ijaniya, it can be assumed that Tira is an assassin on-par or superior to her sisters. According to Headhunter Rabbit, she is an assassin that can use ninjutsu to suddenly attack from the shadows.

In terms of level, she is above Nigun Grid Luin, but falls short below Vesture Kloff Di Laufen.

Tia & Tina
Tia and Tina are Tira's younger triplet sisters. Their exact relationship is unknown, for her two sisters never mentioned her. However, considering they both left Ijaniya while Tira stayed loyal, it can be assumed that their current relationship is strained.

Ainz Ooal Gown
The fact that Tira is currently training new members for the intelligence network of the Sorcerer Kingdom implies that they have some sort of business relationship or have been subjugated under Nazarick's rule.

Currently, by the events of the Fall of the Re-Estize Kingdom, Tira has been given the duty of training human covert operatives for the growing Sorcerer Kingdom in order to fully develop their espionage department. To do this Ainz has even authorized Tira to use several Hanzos to assist her with the task. This implies that Ainz trusts or at least believes in her integrity enough to carry out this assignment without betraying him.

Trivia

 * Tira goes mostly unnamed throughout the Web Novel and much of the Light Novel series. Her name was revealed in a Tweet by the Author on January 22, 2019. Later it was officially canon upon Volume 14's release.