"An enlightened Transient and member of the disciplinary committee at Roppongi Academy in Minato Ward, a school with many powerful and influential affiliates. His Rule converts passion into pure energy, and the danger of such power drives him to demand strict self-discipline both from himself and others. He burns with a deep hostility toward those desperate to be liked, but thinks highly of Ophion, who pulls the strings at Roppongi Academy and is equally cruel to everyone."
https://housamo.wiki/Aizen#transient2