One of my most favorite Evangelions Units out of the entire Eva series, mostly because of the mystery surrounding the Evangelion's sudden destruction. The sister unit of Evangelion Unit 03, Eva Unit 04 never got any screen time, in both Neon Genesis Evangelion and Evangelion 2.22: You Can (Not) Advance. However, it still has received a lot of fame for its appearances in the CR Evangelion Pachinko games.
What I've always wondered is what would the Evangelion Storylines have been like if Evangelion Unit 04 hadn't been destroyed...
3/2/2013 - UPDATE: Decided to go back in and added a few more touches. Hope you like it!
Neon Genesis Evangelion & The Rebuild of Evangelion, Evangelion Unit 04 (C) Hideako Anno, Gainax, Studio Khara, Funamation, etc.