Is bowser jr a new addition to the movie series?

The Super Mario Galaxy Movie introduces Bowser Jr. as a new character in the film series. While the original 2023 film featured Bowser as the primary antagonist, this sequel reveals he has a son, Bowser Jr., who joins him in the outer space adventure. The Wikipedia source explicitly states that Mario and his friends face off against 'Bowser and his son Bowser Jr.,' confirming his debut in the franchise's cinematic universe. His inclusion expands the villain family dynamic beyond the original film's storyline, where only Bowser was established as the threat.