Piebald

Piebald was Lou Jitsu's beloved pet goldfish. When Splinter went to bed, however, the would play with her, setting her bowl up to act as a fifth person for whatever game they were playing. One year prior to the events of Flushed, but Never Forgotten, Piebald's bowl was accidentally shattered during a game of sewer hockey. Desperate to get her to some water so that she could survive, the Turtles put her in their toilet. They then proceeded to play with a flying disc; accidentally hit the flush mechanism for the toilet with the disc, sending Piebald spiraling down through the pipes. Leo forced his brothers to never tell Splinter of this incident, replacing Piebald with an "identical goldfish" which was actually a rock with googly eyes.

During her journey through the sewage system, Trash Wizard attempted to eat her, but spat her back out. Piebald later ate an Oozesquito, which caused her to mutate.

One night, Piebald returned to the to mess with 's psyche, trying to get him to confess to Splinter of what they'd done. She started out by writing graffiti on his wall (which was gone when he went to show Leo), then she interrupted his game of Hot Soup: The Game with unnerving visuals of her coming out of a toilet.

The Turtles were forced to finally believe Mikey when Piebald came out of the Lair's graffiti wall to attack. The Turtles ended up fleeing to the kitchen, where they thought they'd lost her, and encountered Splinter feeding "Piebald" (the googly rock) and asking if Michelangelo had anything to confess, to which he said he "tooted".

One by one, Piebald began picking off the Turtles, and Splinter too, until only Leo was left. She dangled the family above a whirlpool in the sewer, threatening to do to them as was done unto her. Leo summoned up the courage to face Piebald, but she hit the rope with her hook and sent them spiraling toward the whirlpool.

Confusingly to Leo and the other Turtles, however, the rope rebounded before it touched the water, and Splinter was gone. It turned out that Piebald had come to Splinter and the two had worked together to scare the Turtles for their actions.

Weapons and equipment

 * Cloak
 * Hook

Powers and abilities

 * Camouflage: Piebald has the ability to make herself essentially "disappear" into the environment.
 * Bubble production: Piebald can create floating bubbles, which she can even use to distract opponents and hide behind for a surprise attack.
 * Potential reality warping powers: While it's not impossible to have made the disappearing graffiti without powers, she was able to somehow interrupt Michelangelo's game later and scare him with Ringu-esque visuals.