Marceline. Shes been around since the mushroom war. Ik pb was but she was just gum then xD.

THE POOWER OF GEESUS,

I MEAN SCIENCE!!

FP POWER!!!

of coarse finn he is just to awesome

@DerpThatHerp, Marceline is my opinion too :DD my third opinion :D~
@IsabellaFanboy, I guess so.
@redpanda, of course, she's unstoppable so cool >w<~
@jayjay00smile, of course and totally, finn for my 2nd opinion :D

finn's the only one to have beaten the lich and survived. Billy only managed to imprison him, then lich killed him. finn's done things in his life that PB and Marceline, given 100's of years, have never done. that and finn has tons of hidden potential... like that psychic arm he had for "The Tower"... wonder were he got that power...

^great reasoning I'm gonna comment mine :)

FP has been imprisoned for many years but still managed to stay stable, except the time Finn kissed her but I get that, she also has many abilities like flame sword, big fury, small fury, heat sense, scatter fire, snake fire, levitation, inferno shot, flame spells that can aid her in battle, so I think she is powerful, but can be poisoned and weakened by water.

^^who is he reasoning with?

For my opinion FP is the most powerful character of AT, I like your reasoning to FP redpanda
either your TFF too but really for me is FP

^^why Finn is more powerful than any other character

^finn's got the deadliest power of all... luck. Master chief was built on it. survivors depend on it. winners thank it. on top of that finn's also got skill and willpower.