I joined in with an Adventure Time swap on Craftster and made Finn and Jake for my partner (I think I'll have to remake them for my boys!).
Part of the reason I like the show is the design of the characters, and they have great shapes to crochet. Here are the originals to compare:
Finn is about 13" tall and has a backpack that opens and closes with a small button.
Jake is about 8" tall, roughly in proportion to Finn in his normal shape and size, where he still has quite long arms.
Since they both have such thin legs, it's hard to make them stand up, so I took them outside to pose them a bit. Finn's off on an adventure and Jake's hanging around in a tree.
I hope you like them, and if you haven't watched Adventure Time, give it a go!