Orishans are a species of naturally armored aliens from an unknown planet in the Andromeda Galaxy.
Orishans have incredibly tough, red, exoskeleton armor that makes them nearly invulnerable to any attack. They have the ability to unleash tidal wave amounts of water through jets on their hands. In combat their water-based powers allow them to create and control “water whips” to attack enemies. Orishans have the ability to breathe underwater and on land making them amphibious.
- Water Hazard (the Omnitrix's DNA sample of Bivalvan)
- Ultimate Aggregor (1/6 Orishan)
- Ultimate Kevin (part Orishan)
- Orishans appear to have a mouth, but they never move it while talking, similar to Lodestar (prior to Omniverse), Brainstorm, Eatle (prior to Ultimate Alien) and Ultimate Echo Echo.