Walky has an End of Evangelion poster on his wall.  It’s fortunate that he’s a fan of apocalyptic stories featuring giant piloted robots.

There’s also a G.I. Joe poster peeking in there in the last panel.  It’s also fortunate that he’s a fan of secret military special forces which let you dress however the heck you want.

Walky’s pop culture interests are a little on the nose.