Tabula Smaragdina

Tabula Smaragdina (タブラ・スマラグディナ) is a guild member of Ainz Ooal Gown and regarded as one of the 41 Supreme Beings by the NPCs of the Great Tomb of Nazarick. He is the creator of Albedo, Nigredo and Rubedo.

Appearance
Tabula's appearance is that of a humanoid with a head resembling that of a distorted octopus, covered with crooked text tattoos. He has two pupil-less, blue-white murky eyes and his skin color is deathly pale like a corpse. He wore a black cloak decorated with silver accessories and several loosely-fitted belts.

Personality
Tabula Smaragdina has two passions: "gap moe", which is the cute contradiction between the actions of someone and his or her usual character, and horror films, of which he had an extensive knowledge, from the classics to the latest, that surprised even his fellow guild members. His creations Albedo and Nigredo embodied respectively these two hobbies.

Abilities and Powers
In terms of pure destructive power, he is a stronger magic caster than Ainz.

Trivia
Of all the small mechanisms in the Great Tomb of Nazarick, two were by his design.
 * His name is a reference to the Emerald Tablet.
 * He would constantly feed Momonga useless trivia on mythology.
 * He is the creator of CZ2128 Delta in the web novel.
 * He is responsible for the design of Treasury security systems.

I don't know if the treasury security system counts as a small mechanism.