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Robert "Bowser" Bernard Koopa Junior.  usually referred to as Bowser Junior, or simply Junior, is one of the main characters in the SuperMarioLogan series. His and Bowser's real names were revealed to be Robert in "The Koopa Kids!", however, that video was non-canon as the Koopalings miniseries was a remake. However, their name of Robert might be revealed as canon sometime in the future.


From 2013 to mid 2016, he was the spoiled son of Bowser, and was usually parented by Chef Pee Pee, who was constantly annoyed by him. However, as of late 2016 to onwards, he became somewhat more mature. His relationship with Bowser improved to the point where they both love each other and started to bond everyday. Currently Junior doesn’t bother Chef Pee Pee anymore, however, Chef Pee Pee still hates him.


Bowser Junior's personality was extremely variant in earlier videos and over time has had numerous different sides to him.

From 2013 to early 2016, he is shown to be bratty, annoying, racist, dimwitted, whiny, demanding, and mindless and most fans hated him.

Junior is known for being an annoyance to everyone around the house, especially towards Chef Pee Pee, and always caused a disruption that usually leads to Bowser yelling at Chef Pee Pee for it or sometimes vice/versa.

Whenever he asks for something, he usually pesters Chef Pee Pee asking for what he wants. On many occasions, he asks for something very stupid such as in Bowser Junior's Midnight Snack! when he asks Chef Pee Pee to buy him a snack at the gas station even though Chef Pee Pee told Junior that there is a mountain of snacks to eat at the house.

He is also a somewhat picky eater especially in later videos and was also a spoiled brat because in Bowser Junior's Summer Vacation, he demanded Chef Pee Pee to buy him all the trains but he only got two from the store. Junior loves his train toy Thomas a lot, so he gets depressed if he loses it as shown in Bowser Junior Loses Thomas!.

He also got rabies and started acting weird in Bowser Junior Gets Rabies!. When the rabid squirrel bit him, he turned into a wild animal and was foaming at the mouth. Chef Pee Pee gave him a pill and that made Junior feel better and then he bit him. At the end of the video, Bowser Junior said that "Chef Pee Pee was having "babies" himself.

One of the most notable things about Junior is how he has changed over time. In his first appearances in 2013-14, Junior was portrayed as a spoiled brat who portrayed a general child that age.

As of 2015, Junior started to become smarter and more intelligent, but still was stupid sometimes when he was with Joseph and Cody. Since Bowser Junior has turned 8, he has gotten a bit more mature.