Inspiration- all of my OCs (only one of which is listed on this site) are characters from various tidbits or stories that I have been or am writing at this time. I set up their costumes so I could get an idea of how they'd look in real life (strange, I know, but it helps me get my thoughts together).
Backstory- they're characters from stories/books, so of course they have backstories... and extensive ones, at that. Not a single character of any of my books goes through the creative process without having an extensive backstory.
Why- I honestly don't know, but I love it.
"Let's put a cookie on a plate and see what happens to the poor bastard who tries to steal it!"
-Sword Dude to Kari during a pointless argument
Meryl: So, there's something you like?
Solid Snake: Yeah, you've got a great butt!
Meryl: Oh, I see! First it's my eyes, now it's my butt! What's next?
Solid Snake: On the battlefield, you never think about what's next...