Suggestions by @cartoonmultiverse

Fluttershy

as Fluttershy in Tmnt & Sonic: Null and Void

Brutus (Fortnite)

as Brutus in Tmnt & Sonic: Null and Void

Michelangelo (TMNT 2012)

as Mikey in Tmnt & Sonic: Null and Void

Batman (The Batman)

as Bruce Wayne/Batman in Tmnt & Sonic: Null and Void

Professor Charlies Xavier (James McAvoy)

as Charlies Xavier in Tmnt & Sonic: Null and Void

Raphael (TMNT 2012)

as Raph in Tmnt & Sonic: Null and Void

TNtina (Fortnite)

as TNTina in Tmnt & Sonic: Null and Void

Cyclops (Wolverine and X-Men)

as Scott Summers/Cyclops in Tmnt & Sonic: Null and Void

Spike the Dragon

as Spike in Tmnt & Sonic: Null and Void

Midas (Fortnite)

as Midas in Tmnt & Sonic: Null and Void

Uncle chuck (post super genesis wave)

as Uncle Charlies in Tmnt & Sonic: Null and Void

Queen Aleena Hedgehog

as Queen Eleena in Tmnt & Sonic: Null and Void

Tony Stark/Iron Man

as Tony Stark/Iron Man in Tmnt & Sonic: Null and Void

Rogue (X-Men: Evolution)

as Anna Marie/Rogue in Tmnt & Sonic: Null and Void

Rarity

as Rarity in Tmnt & Sonic: Null and Void

Amy Rose

as Amy Rose in Tmnt & Sonic: Null and Void

Modern Sonic

as Sonic in Tmnt & Sonic: Null and Void

Harley Quinn (Injustice 2)

as Harley Quinn in Tmnt & Sonic: Null and Void

Sally Acorn (Archie Comics)

as Sally Acorn in Tmnt & Sonic: Null and Void

King Shark (AOA)

as King shark in Tmnt & Sonic: Null and Void