User blog:MrYokaiAndWatch902/Little spoilers on characters...

From TBFS!

Dome A & Dome B
Dome A is basically like Worrying Triangle, and Dome B is like Hermaphrodite Triangle. According to Dome A, Dome B got his Hermaphrodite personality by eating "a magical cat". Dome A & Dome B are "BTFs" (or Best Twins Forever), unlike the Triangles, who aren't.

Troll Face
As said, he uses old versions of characters (for old, I mean the ones made in 2017 or something like that). Secret: He's getting them from thin air.

Plague Flask
Plague Flask was thought to be dead (hey, peter pettigrew references) when he sprayed a plague and disappeared. Truth: He is not actually dead. He just teleported. And made a grave of himself.

Carnation
Carnation is actually Kabloom's Cuphead-version of himself, with Bubble Wrap even adding "IF you didn't change in the past".