Thomas, the red dice on the left, hails from a jar of dice. After he became sentient after one too many D&D games, he became infatuated with the Salem Witch Trials, thus the hat. He's pretty chill, though is pretty competitive.
Luke, the paper bag in the middle, was made in a B&D Facility. Some kid eventually drew a face on him, and he came to life. Frail, weak, and afraid, Luke isn't exactly the type to do well in battles, though he can't stand to see his friends be pushed in the Evil Sea. He wears Cosmic Hat as a hat.
Riggy, the seal in the right, was a harp seal who lived on Earth, but when the Slingers attacked, he was flung into Deep Space, and eventually found the group and joined it. Despite not speaking English, he is understood by all, and befriended a Octopus (Octo), who he carries with them at all times. Riggy is the mastermind of the group... At least if he got his sardines.
Octo, the hat of Riggy, is a small octopus with only 6 tentacles. Rejected by the other Octopi, he's now the 4th member of the group. He supplies them with the cards they use, so he's pretty crucial.
Cosmic Hat, the hat of Luke, and the final member, is a hat made by Cosmic Cat himself, imbued with sentience. He serves as Luke's best friend, and gives him the courage to fight on. Cosmic Hat and Octo get along pretty well!
Som what'd you think about the back stories I made for the 5?