6. Jake's Brother
Did you know Jake has a sibling besides his adopted pal Finn? Jermaine is his blood related brother, looks almost identical to Jake, and is pictured very briefly in a few episodes. His most noticeable appearance is in "Crystals Have Power", where flashbacks reveal Jake may have accidentally played too rough with his brother at a young age, causing him to briefly alter his attitude regarding violence. Aside from this primary revelation, and being present in several picture frames, our knowledge of Jermaine is naught. What happened to him? Does he have similar powers to Jake? Why is he missing a tooth? This lack of information is intriguing indeed!