Other mutants who are victims of Dr Piranoid and joined the Street Sharks as Allies.

Frogfishface is a woman genetically altered by Dr Piranoid into a Frogfish. Snatched in broad daylight in the back of a grocery store, she is quite grumpy most of the time since she was kidnapped and turned into a fish. Still, her spirit was not broken and she aims to use her new form to make sure the same thing doesnt happen to others. Her mouth can deliver a painful bite and her lure can cause hallucinations to frighten her enemies.

Swallow is a female fashion model kidnapped and transformed by Dr Piranoid into a Gulper Eel. Still very consious about looks, she refused to follow orders from him and escaped before he could get to work on her mind. The Street Sharks found her luring drowning sailors in the bay to safety, claiming to be a mermaid, though sailors believed she was actually a siren. After getting the full story from her, the Street Sharks took her on as an ally. She is very strong and slippery, and she can open her mouth wide enough to swallow enemies much larger than her or deliver a devastating bite, and her claws can rip through solid concrete.

Cooldown is a former snowboarding champ who was kidnapped by Dr Piranoid in the dead of winter and transformed into a narwhal. Due to her pure heart, she refused to work for him and he tried to capture her to work on her mind, but she froze him solid with a blast of cold air from her breath. After escaping, she saved someone from drowning in a frozen lake, which caught the attention of the Street Sharks while they were having a snowball fight and snow-fort-making contest. After making friends with them, she became one of their allies against Dr Piranoid.

Mermasite is a Pool Lifeguard who was kidnapped by Dr Piranoid and transformed into a tongue-eating isopod. He had hoped to create a cunning and deadly killing machine. But instead he got somebody who wants to help others and was pretty peeved at him for kidnapping her. Afterwards, she tried taking over his body, but was stopped by Slobster and Killamari. Afterwards, she escaped into the bay, where she took over a large fish, taking on a mermaid-like form. Afterwards, she began using her new form to help lure more fish into the boats of struggling fishermen. After witnessing the Street Sharks battling Piranoids' Seaviates, she aided then using her hard carapace and sharp claws. She then became their ally.

Coolcumber was a sea cucumber genetically enhanced by Piranoid to aid him and join his Seaviate army. Originally called 'Cruelcumber", this beast was intelligent and dangerous, utilizing his tentacles and poison to grapple and throw his enemies. But during the battle with the Street Sharks, he witnessed how the Sharks were kind to each other, much unlike the other Seaviates were to him and others, hoping to find kindness, he protected them from the other Seaviates and followed them home. He became a new Ally to the sharks, like a pet or mascot and renamed him Coolcumber.

Lionfishtress was once a successful stage actress before being mutated by Dr Piranoid tampering with bottled waters. She transformed into a Lionfish and immediately began searching for answers. Dr Piranoid tried to convince her that the Street Sharks were responsible for her transformation and intended to have her attack them with her poisonous spines and capture them for him. He also planned to use a mind-control formula on her. While she did seek out the Sharks, she didn't trust Piranoid and decided to get the Sharks' side of the story. When they told her of Dr Piranoid's plans for world domination, she allied herself with them against him.