User blog comment:MarvelDCandFantasyFanBoy12/It Again/@comment-3004323-20201006201428/@comment-24839525-20201006202754

I meant two different replies but ok. I'll just do the first three then the second three next.

Igor:

Character: The Blisterknight (voiced by Kevin Michael Richardson) - a thorned Knight who is the friendly gardener.

Episode: Greener Thumb - Helena competes against [the maid] in a gardening challenge.

Growgan and Billy:

Character: The Dungeon Master (voiced by Troy Baker) - a demonic being who forces people to be in his eternal game of DND

Episode: In a Game - Billy, Lorene, Growgan and Nick wind up in a dream realm that is similar to DnD as they have to escape.

Guardian Angel:

Character: Mr. Strange (voiced by Mark Hamill) - a charismatic demon who lives in a dream world of joy and happiness.

Epusode: Joy - Danny and Lena wake up in a dream world of pure happiness as they try to escape