Watched this show?
I love it, which I started watching recently. It really is filled with quite a lot of entertaining adventures and some extremely well developed characters. Lets try and type the main characters.
Finn the Human - ENFP
Jake the Dog - ESTP
Princess Bubblegum - XXFJ for sure. Probably ENFJ. (I haven't seen much of her.)
The Ice King - ? - Hard to type since he obviously is a sociopath.
Marceline Abadeer - XXFP for sure. She screams Fi and is probably an ENFP enneagram 4.
I don't want go in to explanations as to why I have typed the characters the way I have unless someone else starts showing interest for the show/thread.