Crabsformer is a recurring character in Larva Island. He first appeared in the episode "Crabsformer". He was a regular Sally Lightfoot crab on the Island, but once he ate an alien-like robot, he got robot powers, allowing him to turn into a transformer-like tiny crab robot when he's angry. Even though at first Red and Yellow were annoying him like little brats (probably the first time they saw a crab and were curious), he got super mad at them and tried to get rid of them, but with time, and early in season 4, he became friends with the Larva. They teamed up many time, Yellow helping Crabsformer when he was rejected by the other crabs, who were caught by Chuck, the other crabs and him then fused together to become King Crabsformer, defeating Chuck. He seems to get along pretty well with the mudskippers and Clara. In the Larva Rangers episodes of season 4, he was one of the new character who became rangers to help Red and Yellow to fight Grey, Green and the Silvers who invaded the island. His robot changed from Brown's older rangers bot.
He is very brave, as seen in many scenes where he will save the other crabs, especially Salmon, his girlfriend. He is usually calm and looks cute, but when angered he will get mad pretty easily and thus turn into his robot form. He is a good friend, as seen interacting with other characters, like Red or Mango.
He appeared in every series or movie since his first appearance in Larva Island, he then appeared in Larva Island : The Movie, Larva Pendant, and Larva Family.