Adventure Time Season 1 Characters & Cast — No Spoilers
Every character in Adventure Time season 1 with photos and the actors who play them, including Jeremy Shada, John DiMaggio, Tom Kenny — spoiler-free, nothing from later seasons.
- Finn the Human (voice) — played by Jeremy Shada
- Jake the Dog (voice) — played by John DiMaggio
- Ice King (voice) — played by Tom Kenny
- Princess Bubblegum (voice) — played by Hynden Walch
- Marceline the Vampire Queen (voice) — played by Olivia Olson
- BMO / Lady Rainicorn (voice) — played by Niki Yang
- Lumpy Space Princess (voice) — played by Pendleton Ward
- Tree Trunks (voice) — played by Polly Lou Livingston
- Dark Magician (voice) — played by Mark Hamill
- — — played by Brian Posehn
- Donny (voice) — played by Kevin Michael Richardson
- Ricardio (voice) — played by George Takei
- Neptr (voice) — played by Andy Milonakis
- Billy (voice) — played by Lou Ferrigno
- Mr. Cream Puff / Mr. Cupcake / Chet (voice) — played by Dee Bradley Baker
- Manfried / Chocoberry / Candy Corn Girl (voice) — played by Maria Bamford
- Eclair Boy (voice) — played by Jackie Buscarino
- Zombie Candy Heart / Peppermint Butler / Gumball Guardian #2 (voice) — played by Steve Little
- Key-per (voice) — played by John Moschitta Jr.
- Cookie (voice) — played by Henry Rollins
All seasons of Adventure Time: full spoiler-free character guide