Io is one of Jupiter’s moons and he is (kind of) friends with Ganymede. Ganymede gets excited a lot and he could be deemed “crazy” but.. wait I don’t have an excuse for that.. He goes on adventures with Europa, Ganymede, and Callisto and he normally has to be paired with Callisto when they split up into 2. Ganymede is with Europa. Io gets defensive when it comes to strangers. He’s also very curious. He thinks he’s friend with Callisto. Callisto does not like his company that much.