>>149416145
She's an X-Men character with the ability to turn into a shark person, and probably best known for her appearance in the comic with Sauron ranting about just wanting to turn people into dinosaurs, which was Spider-Man & the X-Men.
For a full list of appearances, check out: https://comicvine.gamespot.com/shark-girl/4005-86424/issues-cover/ and click on the appearance number under the various titles to get specific issues.