Narberal Gamma

Narberal Gamma is one of the main supporting characters in Overlord.

She is:

• A battle maid (Pleiades combat maid unit) serving under Ainz Ooal Gown
• One of the few NPCs created personally by one of Ainz's guildmates (CZ Delta's creator was actually a different member, but Narberal was made by a player known for favoring heteromorphic/monster-type characters)
• A doppelgänger (shape-shifter) disguised as a human adventurer named Nabe
• Extremely powerful (level 63, considered very strong by New World standards)
• Fanatically loyal to Ainz, viewing him as the supreme being
• Cold, arrogant, and openly contemptuous toward humans (whom she calls "maggots" or "inferior lifeforms" when not restraining herself)
• Usually emotionless and blunt, but shows subtle signs of frustration when forced to act subservient or polite toward humans while in her Nabe persona

Her most iconic traits are:

• Her catchphrase variations of "That's because you're a maggot/lowly human" (said in her mind or muttered under her breath)
• Her habit of almost constantly suggesting they just kill annoying humans
• Her impressive magical combat ability (specializing in lightning- and elemental-type offensive magic)

In short: Narberal is Ainz's beautiful, deadly, human-hating battle maid companion who accompanies him (as Momon and Nabe) on adventurer quests while barely containing her disdain for everyone around them except her master.