Bowser_Juniors_good_heart in Bowser Jr. Fan Club
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And he told Bowser Jr that Peach is his mom and he hates Mario because Mario is the only thing between Bowser Jr and the koopalings to a full family.
In Mario lore Bowser was an orphan and many of his actions were the cause of that. He adopted the koopalings to give them a life better than his. He's obssesed with kidnapping Peach because he wants Bowser Jr and the koopalings to have a full family.