Thread:PhoenixFirestorm/@comment-44728141-20200203233253

John Constantine (The Arrowverse version for fairness)

Kefka Palazzo (Not IC for him to just 'turn off' people's magical abilties. In fact he might not actually be able to. i'll research that later)

Sephiroth (Alien demigod who can control dimensions and such)

Doctor Strange (MCU version for fairness)

Akira Kurusu (Persona is a magical verse. It just so happens to be modern)

Not sure whether or not you're familiar with these characters. Just wanted to suggest a few opponents. 