Jeff the Land Shark in his symbiote form from the Marvel Comic Venom Wars: It's Jeff #1.
Positive Prompts: SymJLS, furry, feral, marine, shark, fin, white sclera, no pupils, dark-purple body, white body, two tone body, tail fin, sharp teeth
Extra: goo (might make his tongue goo-like too if you choose to do this which is not intended)
Replace feral with anthro if you want the anthro form instead. Also if the skin color appears too purple, then put "black skin" instead and that should help.