Ripjaws looks like a anglerfish mixed with an shark and a eel. In the original series, he had extremely sharp teeth, a big black fin, sharp claws, and small circle shaped eyes.
In Ultimate Alien, he now has visble lips, and has no signs of black color on him whatsoever. He is now mostly grey and white with all fins being colored green. His eyes are now also green with black pupils, and green eyebrows.
He has a phosphorescent light on his head and 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 luminescent angler also allows him to see in dark areas.
Ripjaws uses his claw-tipped fins and razor-sharp teeth to attack enemies with strength superior to a person. His powerful jaws can bite through metal. Ripjaws also can unhinge his lower jaw to swallow large objects in a single bite. He can also transform his legs into a fish-like tail and vice versa.
Ripjaws's most greatest weakness is his inability to stay out of water for too long, requiring water to keep him from dehydrating. Fire also dehydrates him much quicker, as seen when Ben in the original series turned into Heatjaws.
In Ultimate Alien, Ben called Ripjaws "an old favorite", which is strange because he was one of the least used aliens in the original series. This may mean that Ben liked Ripjaws but didn't use him because he needs water to breathe.
Ripjaws did not appear in Season 3 of Ben 10. However, he did try to turn into him twice but the Omnitrix didn't give him Ripjaws.
Ripjaws is the least used alien in the original series being only used 9 times.
All of Ripjaws's accidental transformations in the original series had XLR8 as the selected alien, except for Sleepaway Camper.