Nagi Ryou (凪良) is probably best know for the game designs of Ar Tonelico. And if you haven't seen those, then he's probably pretty new to you. Nagi Ryou also has a circle called S.E.C., though as far as I know he's the only one in it.
Influence was a Comiket 76 release, featuring Nagi Ryou's take on anime and art work that influences him. I would guess Neon Genesis Evangelion was the greatest influence as it gets the most pages, but of course that might also be coincidence.