"I, Dark, can be the protagonist in different worlds? Now that's awesome~"
Dark Naruto: "What's so bad about Infinite Tsukuyomi?"
Dark Luffy: "I'm the King of the Pirates! Monkey D. Luffy!"
Dark Itadori: "Don't look up, okay~~ Sukuna--"
Dark Shirou: "It's the Tree of Qliphoth~"
Dark Ichigo: "...The Schrift D!"
...Huh? Is something off here? This isn't quite what I had in mind?
+ "You'll regret this! Hinata! Nine-Faced Sopa!"
+ "I'm the Hokage! Naruto! Golden Wheel Reincarnation Explosion!"
(Naruto, Bleach, One Piece, Inuyasha, Jujutsu Kaisen, Fate/Grand Order...maybe Katekyo Hitman Reborn too... Could we go to Ultraman?)