Gaming controllers, Polturgusts, Punches, Kicks, etc.
Gaming, his friends and family, adventures, coins and money, Henry and Samantha, SMG4, Mario, etc.
Ghosts, Bullies, People leaving him out and not including him, Phillip and Kelly Bomb, Drill Finger, SMG3, etc.
Luigi is the cowardly brave (yet gay) younger brother of Mario. He is a friend of SMG4 as well. Despite being gay Luigi hates being called gay especially by Mario. Luigi used to suck up Ghosts in his Mansion or help Mario save Peach. Now he's just another laid back guy. He sometimes fills in for Mario (whenever he's vacationing in places like Hawaii) in SMG4's adventures to save Henry and Samantha from evil villains and whatnot. He's also a Gamer.