[Rico]

I'd name it Nitori just because I love making Touhou reference, and Nitori is the only character that is underwater based (Kappa :D). Well, maybe Iku (but she's more Jhon Travolta than anything). DISCO DANCE DISCO DANCE.

Othen than that, I kinda like the name Archibald because it's the first name of Capitain Hadock in Tintin (Yeah, I know that, and it is said precisely once, in the last one, Tintin et les Picaros). Seems kinda fitting, but you short it to Arch or something.

Or for the lulz, you can call him Sushi <.<