Milly Bear

Biography
Milly met Greg Dog at some point and they began dating, but she was unaware of his evil nature.

Milly sailed with Greg to Adam Island, where Greg threatened his old enemy Bubby Kristy, a superhero cat. She ordered her husband Doccy Zeus to attack Milly. The dogs escaped. Shortly after, Greg merged Adam Island with City Island somehow (later he added his island Greg's Home Island). Greg planned to blow up the three islands at once, but Milly stopped him, furious. Bubby activated the bomb again, thinking she was disarming it. Subsequently, she and Milly had a duel, but both lived. Presumably, Milly thought Bubby was evil and she reconciled with Greg.

That Christmas, Captain Elf, an evil elf, randomly selected Bubby and her friends to be tortured om Elf Island. He brainwashed Santa Claus into being evil, and they attacked the cats. Greg and Milly arrived, and the elves thought of them as more foes. Bubby, however, took everybody to safety in an ice cavern. There, Doccy and Clyde had a snowball fight with Greg, but Milly and Bubby discussed defeating Captain Elf, making Bubby realise Milly was good. They indeed defeated the elf, but Santa was not saved. With the suprise yet unintentional help of Santa's rival, Easter Bunny, Santa was reverted to normal, thus they battled the Bunny and won. Milly and Greg returned to their home

Milly and Greg went to Greek Island, coincidentally at the same time Bubby and friends went. Milly stayed in the hotel while Greg actively tried to kill the cats, but was hospitalised. The next morning, Milly informed the cats Greg was out of hospital, seconds before the insane Greg appeared. Determined to kill the cats, he fatally stabbed Milly. A long and sad funeral was held for her after Greg's defeat.

Post-mortem
Greg constructed the MillBot after Milly's death, showing he still cared. However, after two battles with Bubby, the robot was destroyed and sunk into the ocean.

Milly somehow made contact with the living world again, perhaps as a spirit, giving Bubby a hint not to trust Zara Maxwell.

Although not mentioned, Milly was technically replaced by Zara, a spy for Greg that was more loyal to him. However, Greg was not romantically attached to Zara.

Although not mentioned, apparently Milly was the one who made the cool breeze to wake Bubby up and find a clue left by Zara that Greg was after her parents.