You could call him Percy... Neptune, Haymitch, (you can tell I like books ?)
Now I’ll just list blue characters in stuff: Nightcrawler, Ronan, Stitch, Gonzo, Thrawn (as in Admiral Thrawn from Star Wars) Yondu, I could go on and on but I won’t. It would take a while! ? I hope you find a good name, beautiful Betta!