Raphael and Michelangelo mostly have a love-hate relationship in which Michelangelo frequently antagonizes Raphael (it especially hurts Raphael's pride that Michelangelo has bested him more than once, both times because Raphael's anger got in the way), but Raphael shows that he cares about him whenever he's in danger. He also seems to be very close with Donatello, where the two are often paired together when Leonardo and Raphael are either arguing or training. Also, Mikey is often the one most enthusiastic about Donatello's newest finished invention, and would jump straight into "helping" Don with his first test run on it, though his "help" is not greatly appreciated by the latter and often generates more trouble. Donatello has also invented a hovercraft- a flying skateboard, at one point of time in Season 2 as means of keeping him quiet while Donatello himself worked. Even his older brothers irritated of him, he is still lovable brother and like a baby brother to them. When Mikey was a kid, he and his brothers went with Master Splinter to Japan to bury Master Yoshi's ashes next to his beloved. While there they helped Master Splinter and the Ancient One win a fight against a ghost that was sent by the Foot Mystics to revive the Demon Shredder and that is when they gain their ninja masks. This happens in the episode (Fathers and Sons).