Koopina first major appearance in Koopa tournement 3.0, however, he appeared in MLSS #32. Not much is known about him, other than his arm and right eye were built by Dr. kroopa.
Koopina has been like how he is since he can remember. He always got made fun of, or treated like he was weak becasue he only had one arm. But then he Discovered Dr. Kroopa, and he had Kroopa Build him a mechanical eye and arm.
The creationEditKoopina was created as an overpowered Mary-Sue type character. But that was many years ago before I discovered Smackjeeves.com.
His old design wasn't much differant from his current one, as seen above. His old design was Mario and Luigi Bowser's Inside Story style, instead of superstar saga. In the old his machanical eye was his left eye, instead of his right. Also, his old design had orange shoes and a blue shell, when he now has blue shoes and an orange shell.