In Space Adventure Cobra, Crystal Bowie is an elite assassin with a crystal body that reflects deadly beams, and he enjoys brainwashing and pitting women against each other.
Crocodile from One Piece is a smug Warlord of the Sea who can turn into sand and wields a golden hook, inflicting slow suffering on his opponents.
Alois Trancy in Black Butler is a 14-year-old Earl with a traumatic past, surrounded by demon servants, and known for his rich and entitled personality.
Sailor Galaxia from Sailor Moon was the strongest Sailor Guardian, turned power-hungry after sealing Chaos within herself, and is later restored to her noble self by Sailor Moon.
Zeldris in The Seven Deadly Sins, the Demon King's second son and leader of the Ten Commandments, possesses powerful abilities and eventually joins forces with the Sins.
Isabella, the main antagonist in The Promised Neverland, is the custodian of Grace Field House who cunningly thwarts escape plans while raising orphans for demons.
Griffith/Femto from Berserk is an ambitious antagonist who sacrifices his army to become the archdemon Femto, gaining abilities like telekinesis and space manipulation.
Esdeath in Akame ga Kill! is a ruthless General with the ability to manipulate ice and freeze time, whose one-sided infatuation with the protagonist leads to her downfall.