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Millie Burtonburger is the daughter of Burt Burtonburger and the younger sister of Coop Burtonburger. She becomes Kat's owner, and is the direct cause to the events of Kid vs Kat. Some viewers describe her as adorable or beautiful.Edit
Friends: Princess Morbucks, Mojo Jojo, The Amoeba Boys, Fuzzy Lumpkins, HIM, Mandark, Old Lady Munson, Bell, Kat (pet), Topaz, Aquamarine, Yellow Diamond, Blue Diamond, Yellow Pearl, Blue Pearl, Bianca Bikini, Barbarus Bikini, The Gangreen Gang, The Cluster, Aku, Samantha (at times), Zim, GIR, Gaz Membrane (at times), Tak (at times)
Enemies: Blossom, Bubbles, Buttercup, Coop, Courage, Dexter, Dennis, Steven Universe, The Crystal Gems, Connie Maheswaran, Lars Barriga, Sadie Miller, Jamie, Onion, Professor Utonium, Samurai Jack, Jenny Wakeman/XJ9, Sheldon Lee, Samantha (at times), Dib Membrane, Gaz Membrane (at times), Professor Membrane, Dr. Noreen Wakeman, Tak (at times)
Relatives: Coop (older brother), Burt (father), Kat (pet)
She is fan-based off Mandark from Dexter's Laboratory.
She is the main rival of Bubbles from Powerpuff Girls.