Junior

12 ("The Good Egg" to Present) |species=Koopa|gender=Male|pronouns=He/Him|weapon=Magic Paintbrush|birthday=August 26|height=4'8 (1.422 m)|weight=176.9lbs (80.2 kg)|powers=Fireball|hair=Outrageous Orange|eyes=Black|affiliation(s)=* Bowser's Army|occupation(s)=* Guardian
 * caption1=|nicknames=* Jun (Steven)
 * Junior (friends and family)
 * Food (Yoshi Tribe) |alias=* Prince Bowser Jr|age=11 ("Multiverse at Stake!" to "The End of a Chapter..?")
 * Leader
 * Prince|alignment=Worlds Colliders|status=Alive (revived) |relative(s)=* Bowser (father)
 * Unknown Mother (mother; supposedly deceased)
 * Lemmy, Larry, Iggy, Morton, Roy, Ludwig (brothers)
 * Wendy (sister)
 * Boom Boom, Pom Pom (cousin) |friend(s)=*Steven (best friend)
 * Garnet
 * Ruby
 * Sapphire
 * Amethyst
 * Pearl
 * Peridot
 * Spinel
 * Bismuth
 * Lapis Lazuli
 * Connie Maheswaran
 * Rafael (best friend)
 * Simon (best friend)
 * Kobo
 * Infernio
 * Skully
 * Petey Piranha
 * CHB|first_appearance=* "Multiverse at Stake!" (first series)
 * "The Good Egg" (continued series) |music_theme="Yoshi and Cookies"|voice_actor=Caety Sagoian (main games)}}Bowser. Jr, one of the youngest sons of Bowser and his successor, is a twelve-year-old Koopa. He is the son of King Bowser Koopa and his unknown mother. He and his best friend Steven lead the Worlds Colliders, and he was the one who had come up with the name.

Junior does not like to be seen as an evil person when leading the group and tends to leave his other personality behind to do good things and achieve dreams.

Appearance
Bowser Jr takes a lot of characteristics from his father, that being his facial features and overall build. He has a lemon yellow complexion, with his head being lime green. He has outrageous orange ponytail, which can be messy at times with big bushy eyes being the same colour. Junior tends to wear a bib with an evil mouth on, and will sometimes put it over his face to make him seem the complete opposite of cute and more intimidating. He has a green shell with small spikes on the back and has long sharp claws on other his hands and feet.

Personality
Junior's personality in the series is determined, brave, somewhat keen for his age. He is passionate yet slightly evil. He can be seen caring and supportive to his friends and others around him, despite his vague and discourteous personality back in his home universe. He sometimes has a tough time figuring out what is right and wrong due to him raised as an evil-dooer, but his friends are always there to help him no matter what. He is a huge risk-taker and adventure-seeker and will do anything in his power to make someone smile. However, when frustrated, he could lash out in anger, passive-aggressively.

Overall, Junior is a fun person to be around and is very committing and sometimes naive.

Trivia

 * Junior actually widely dislikes the concept of Steven's healing ability, he is seen as being really grossed out by Steven's saliva or tears, and whenever he would get hurt he'd ten to want to heal naturally. Steven would still ask even if Jr would reject the offer.
 * Junior is seemingly smart for his age. He can seem immature or childish at times as he is still 12, but does show decency and common sense frequently.