Playing with creative AU concept these days, some of them will get develop.

[Terraria] - Devourer

[Terraria] - Eater of Souls

Undertale, but nothing's wrong.

[Terraria] - Corrupted Goldfish

Goat Frisk and Pup Kris

[Slay The Spire] - Lagavulin

[X-Tale] - Muffet

Tenna in Picocad2

[Terraria] - Eater of Worlds