Johnny Unusual
(He/Him)
Jake was lower on my list because he's less sidekick... most of the time. Usually he's more co-lead. But he's also such a chill guy, he often will intentionally take on that role for the sake of his brother Finn. In a lot of ways, he's pretty flakey and at times has occasionally proved a little less than reliable (due to him being easily distracted or his laid back attitude being TOO laid back for a dire situation) but most of the time he's a friend you can trust. And also, THIS GUY GETS IT.The last tie of the list!
The stretchiest companion! Jake is a shapeshifting dog and he and Finn were raised together. Jake shapeshifts to pick locks, fight and really just do whatever he feels like doing at that moment. He's got a bit of greediness and laziness to him but is still a heartwarming companion to his adopted brother.
He's also oddly good at skateboarding and cooking as @jpfriction noted: