The final main Koopaling in the storyline, the eldest of Bowser's sons uses the different chains in the room to hang from while shooting magic down at Mario. (gamingreinvented.com)
Occasionally, he'll summon a pair of Koopalings (Wendy and Roy, or Larry and Ludwig) from portals to assist him, all of which are at level 46. (mariowiki.com)
NOTE: If you want to see all these costumes, google them because they all appear in Rayman Legends (tho some of them are console exclusive) these are the ones i want in because if Sakurai can make Koopalings as Bowser Jr's alts, then he can make these costumes as alts for Rayman too!! (mariopartylegacy.com)