I thought that was a kinda bad thing to do; it reminds me of inserting yourself into Sonic the Hedgehog fan-fiction; the joke goes something like: in (any) sonic fan fiction, the author shows up with the characters and is totally rad and cool, everyone likes him and wants to be him (or have sex with him). He's super powerful, god-like, and... well, it sucks.
But the insertion in Metal Gear Solid 5 is kinda cute/neat to me~ It makes me wonder if I was wrong with my idea of "any self-insertion of the author into their art is lame". I know an author's art represents the author to a degree, but to insert my self/person/avatar into Eve's world and have him totally creep on Eve, is totally not a good idea to me.
You can vicariously be inserted into the world/story with a secondary character representing you (maybe Eve's Master is MEEEE OoooWWWeeeeeooo!). But to be like, "I'm in the world, as I am, with my... everything, standing side-by-side the other characters" has always been lame.
Maybe you can do it right. And obviously wrong, 'cause all my previous author-inserting-themselves-into-the-story have been pretty lame. It's not like I'm researching it though. Maybe I just hit the bad ones way back when and never recovered.
Anyway, I thought I'd draw something and see if you've anything to say about self-insertion. ...No Eve, not that kind, but she is pretty clever/smart of men, isn't she...~