Io

Io, whose full name is Ioladio Virvega, is a female member of the demon god clan who makes her appearance in the Demon Realm arc of the second season of Four Knights of the Apocalypse. With her companions held hostage by King Arthur, she was left with no choice but to operate as an assassin tasked with eliminating the Four Knights. Her unique ability known as 'Interference' allows her to block the perception and detection of others, making her movements nearly impossible to trace. Upon her debut, she projects an air of striking beauty and quiet mystery. However, after crossing blades with Tristan and receiving his act of salvation, the painful truth behind her forced allegiance is finally revealed. She subsequently shifts her stance to offer assistance, establishing herself as a character of layered emotions and a deeply complicated past.