Stunslinger
"It's High Tide."
Originating under the waters of Leviathan Lagoon, Stunslinger was always on guard. When there's Leviathans around your home, you need to be. Most would stay away from the water best as possible, but not Stunslinger.
With his custom-made bubble gun, he was well protected from the giant fish that threatened to devour him. With just a reload and a lightning fast click, Stunslinger could stun any fish, hence the name.
However, eventually he got bored of the giant beast. So, seeking thrills in his life, he swam with high speeds to the nearest Leviathanless land. And, when needing to take the air, he'd hitchhike other ships.
Eventually, he hitchhiked the ship of Cap'n Flynn, occupied by two Skylanders: Wash Buckler and Bouncer. Amazed by his determination and abilities, the two asked if Stunslinger would like to train for being a Skylander himself. And, after remembering what he bared witness back in his homeland, Stunslinger graciously agreed.