Suggestions by @jdeav

Lucifer Magne

as Toadsworth in Super Alastor Bros.

Sam (Trick 'r Treat)

as Toadette in Super Alastor Bros.

Cletus (Helluva Boss)

as Bowser Jr. in Super Alastor Bros.

Professor Zoom / Reverse-Flash (Eobard Thawne)

as King K. Rool in Super Alastor Bros.

Kid Flash (Wally West)

as Kiddy Kong in Super Alastor Bros.

Jesse Quick

as Dixie Kong in Super Alastor Bros.

The Flash

as Diddy Kong in Super Alastor Bros.

Vaggie (Hazbin Hotel)

as Birdo in Super Alastor Bros.

Husk (Hazbin Hotel)

as Yoshi in Super Alastor Bros.

Sera (Hazbin Hotel)

as Rosalina in Super Alastor Bros.

Cherri Bomb

as Princess Daisy in Super Alastor Bros.

Valentino (Hazbin Hotel)

as Waluigi in Super Alastor Bros.

Vox (Hazbin Hotel)

as Wario in Super Alastor Bros.

Flash (Jay Garrick)

as Cranky Kong in Super Alastor Bros.

Lute (Hazbin Hotel)

as Kamek in Super Alastor Bros.

🦍Gorilla Grodd🦍

as Donkey Kong in Super Alastor Bros.

Adam (Hazbin Hotel)

as Bowser in Super Alastor Bros.

Niffty

as Toad in Super Alastor Bros.

Angel Dust (Hazbin Hotel)

as Luigi in Super Alastor Bros.

Alastor (Hazbin Hotel)

as Mario in Super Alastor Bros.