Technically, Gurren is inspired mainly by Ken Ishikawa's work like this and Getter Robo. If you want more stuff like it, check out the Getter Robo Armageddon OVA on youtube, it's fully subbed and HD!
-me beating off-
-the faceless hentai man appears-
-but he has those eyes-
-immediately stop beating off-
-wait five seconds-
-starts beating off faster-
This has really helped my speedrun for Mortis Ghosts's RPG classic, OFF.
Oh, man. Does that Yuuto guy not know he's been using Charm?
Imagine thinking you're really charismatic but learning you've been mind-controlling people without realizing it...