Dr. Kleiner

Dr. Kleiner is an old man who appeared in the blooper "SwagQuest".

Appearence
When Luigi is not allowed to go to Mario's party because he doesn't have enough swag, he seeks lessons from Bowser on how to obtain swag. After a few minutes, Bowser tells Luigi to change his clothes, to add swag. After 4 clothes changes, Luigi and Bowser settle on a gangster costume. Then, an old man runs up to Luigi and slashes his clothes off, causing Bowser to force Luigi to fight the Old Man, stating that he "ruined Luigi's swag." Luigi is afraid at first, but gains the courage to insult the Old Man, calling him creepy. The Old Man gets angry and Luigi starts rapping. The Old Man reminds him that this is a fight, and a short battle ensues. The Old Man strikes Luigi with a multicolored ball, who counterattacks with a "Big Gay Dance." The Old Man then throws a fireball at Luigi, who ducks as it ricochetes off a tree, blasting the former into the air and crash into a boat, which sinks.