Yes, you guessed right. It’s named after the main character of the classic game. If you know why the character was named Ryu, you will understand why I named this theme Ryu, too. :)
I mentioned this in my previous post about the Further theme, Behind the Design of the Further Theme, too that I strongly believe that we, as WordPress theme designers, should create amazing themes for specific purposes/audiences rather than multi-purpose themes that are just good. In many cases, themes designed for a specific purpose or a targeted audience perform better when people use them for that purpose. I’ve created Ryu specifically for the Facebook, Tumblr, and Twitter generation of personal bloggers.