"DovahFinn" by RadioStarKiller 1
"Adventure Time Thinks With Portals" by TrebleChibi 3
2 Strange that I never noticed it before, but Troy and Abed's friendship is pretty similar to Finn and Jake's. Their bond is adventure.
3 What's up with all these Portal\Adventure Time mashups? It's like peanut butter and chocolate, I tell you.