Flying sea creatures

https://preview.redd.it/bbuxarznjdgh1.png?width=1098&format=png&auto=webp&s=b563ca9dbe3dd70165c3032f898380f7afebfbdd

Ben 10 - Jetray is the go to flying alien during UAF and as his name suggests he is inspired by a manta ray

https://preview.redd.it/jj0fdnutjdgh1.png?width=464&format=png&auto=webp&s=898ea1ee1aed1c5e8e8c7aaa5ecbd87d6b21b1be

Kamen Rider Ryuki - Evildiver, Kamen Rider Raia's contract monster is a manta ray, however since most fight take place far from the water it is capable of flying

https://preview.redd.it/rzm1co46kdgh1.png?width=970&format=png&auto=webp&s=4a8697de81e43cd1ae109da64da45280324970eb

Avatar: The Last Airbender - In the original concept art, Appa was a hybrid of a bison and a manatee