In Jujutsu Kaisen, Ryomen Sukuna, the primary antagonist, changes form many times as he eats more fingers. Here's the ranking ...
Comic Book Resources on MSN

All of Sukuna's forms, ranked by strength

The King of Curses takes on various forms in JJK, each of which is dangerous enough to pose a threat to the series' strongest ...
The Culling Game Arc in Jujutsu Kaisen Season 3 introduces someone with the potential to be as powerful as Satoru Gojo.
Never at a loss for words, Jujutsu Kaisen's Gojo had an exceptional gift of gab. It wasn't all braggadocio, though, much was quite profound.