Wow, the green army men are great!
You have to consider where you're wearing the costume. Depending on the crowd, a lot of them don't get the anime costumes even if they're well done and it'll be a major let-down because nobody knows who you are.
On the other hand, if it is an anime friendly crowd, Mustang is a very popular character and you'll get a lot of attention from the girls...
The more generic or popular costumes play well at general parties and gatherings.