As a kid, Bubblegum was created in a cell in a science lab, tested on and she does not like the scientists that killed her every associate. She escaped, but her friend, Lemon, ( A Yellow axolotl with green-tipped paws, tail and gills, ) was seriously injured after the escape, and unfortunately passed away from blood loss. Bubblegum grew up lonely and is now very protective of those who had to grow up the same way she did. She doesn't forgive the scientists, and never will. She will attack. She will persist forward. For Lemon. She has to kill the scientists... After all, who goes down without a fight?
Credit to BONIIX and XxMid_NightxX.