Ripjaws is one of the original 10, of the 19 aliens in the Omnitirix that Ben Tennyson can turn into. He shares a number of traits of Earth aquatic life, alligators, eels, anglerfish and sharks. He can change between a fish tail or legs at will, and has a phosphorescent light on his head. He is able to breathe underwater, as well as swim at high speeds with amazing agility and can also withstand very strong water pressure. His angler allows him to see in dark areas. His body is mostly grey. He where's the Omnitrix symbol on his left torso. Ripjaws has an oversized strength able to lift more than his own weight, and underwater, he can swim with high speed, probably faster than a military torpedo. His big jaws and sharp teeth have proven to be his most deadly weapon, being able to literally shred even steel from cars. His body has also great endurance (underwater) and can withstand high pressures, meaning he possess the nature of abyssal aquatic life, hence his blank eyes and the anglerfish light in his forehead, which can serve as a spotlight in dark areas. He displays the distinctive feature of turning his legs into a fish's tail and vice-versa, giving him a merman-like appearance underwater, while outside the water environment, he displays a loincloth with a similar pattern to his tail (implying the loincloth wraps around his legs, fusing with it and becoming the tail). Ripjaws's greatest weakness is his inability to stay out of water for too long, requiring water to keep him from dehydrating. This weakness sometimes makes Ripjaws somewhat of a comic relief, in situations where Ben accidently turns into him in places void of water. However when Ripjaws dose fight underwater he proves to be quite tought, being responsible for some of the most goary violence in the show.
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http://ben10.wikia.com/wiki/Ripjaws
Ripjaws (with tail)