Mike wouldn't really consider himself mellow, he just tended to internalize all of his feelings about most everything, so that along with the fact that he wore Hawaiian print shirts probably made him look more chill than he actually was.
"Yeah. I set an evil hotel room on fire and died in it." Which came out a lot more mild than it needed to but what was done was done. "And then I was here. But no, not really. I just kind of practiced on my own. Honestly, I don't even really bother with the other ghosts. Theyre....ah. Too much like ghosts?"