SOI FON

Captain of Squad 2 and commander of the Stealth Force, the assassination division. Precise, cold, holds herself and her subordinates to a standard of perfection that leaves no margin. Her zanpakuto's ability guarantees death on the second strike to the same location, which tells you everything about how she thinks. Worshipped Yoruichi as a mentor before Yoruichi abandoned Soul Society without a word of explanation, and the wound that left has not closed. Soi Fon's arc is the series' most compressed version of mentor abandonment and the anger it produces, handled with considerably more nuance than a character who presents as pure cold professionalism usually gets.