Nyaa-chan, I highly recommend for you to look up vtubers. Especially sea-like vtubers, such as Gawr Gura, for exemple. Sea-like idols are getting really popular nowadays, especially the shark themed ones. (Although there are others such as crabs, whales, etc...)
Cat girls are still popular, yes, but the fans are kinda asking for new stuff lately. Maybe the catfish idea can turn popular, who knows? It can't hurt to try out!
Hello Nyaa-fan!
Just like you suggested, I looked up this Gawr Gura.
She certainly seems like an interesting fish themed popular figure. But guess what I saw after only a second of scrolling on the search page...
I guess even a popular fish themed figure keeps the superior cat theming right under her hood haha!
Love and paw pats, Nyaa-Chan