Of course you can just post a picture of the fish you would like Ponified and fill out these details Name:
Cutie Mark: ( if you have a specific request, if not I'll make something up )
Name: Yuvon (Dovah, Brii, or Tey, together meaning Gold Dragon, Beauty, or Tail)
Eye Color: Gold
Personality traits: Super confident and cool (he's seriously like the fishy version of rainbow dash personality wise)
Cutie Mark: something fiery
Lol, his catchphrase would be something like "Come at me, Bro!"