Ren Kralwer is a major anti Hero in Bakugan gundalin Invadersis also the last descendant of the Protectors of the Dark Bakugan. He served Bardous with the hope of living in the sunshine. He infultrated the battle Bralwers telling him that his home of Gundalia was under attack. After Fabia Sheen and Shun Kazami expose him as a fraud he fight the Bralwers alongside the Gundalion agents. However once he realizes that the Twelve Orders were untrustworthy and held no care for him, he turns his back on them, joins the Neathian side, and becomes a Castle Knight eventully having his teammates join the fight aginst Bardous as well. he is Now the Commander of the Gundalian Forces under the commands of Prime Minister Nurzak.
Ren grew up having a trgic past as he was forced to live underground. He starts off having rocky relationships with most of his teammates and the brawlers. While Marucho trusted him, feeling indebted for the Phantom Data Ren gave him, Shun was suspicious of him from the start and had no problem with exposing his true purpose after hearing Fabia's side of the story. Ren's own teammates teased him when he forgot his mission due to his bond with the Battle Brawlers.
However after his team kept getting punshied Ren felt really bad for them which caused him to leave the Twelve orders and join the Bralwers seeing how nice they were to him orginally.
Ren first appeard asking Dan Kuso Marucho Marukura and Shun Kazami of they were the Bralwers after an akward introduction Ren introduces himself and says he got new phantom data to thanks to this Bakugan interspace was made. He later meets Jake Vallory the subtera battle brlawer. After shun wins wins match in interscapce, he and Dan battle it out. In the middle of the fight Dan gets knocked out and sees Bakugan at war, something that everyone finds strange except Ren.