So, I'm sure lots of us have created an original character or three for our stories. Obviously, they'd also be original if you're doing a completely original story and not a fanfic. I've created a lot of them myself, mainly because my Fire Emblem fic has almost a completely original cast of characters (the only exceptions are Ike, Elincia, Ranulf, Boyd, Soren, and Geoffrey. And even then, that last one only appears in the first chapter).
I've created several OCs for both Fire Emblem and The Legend of Zelda, so I'll list my favs for both.
Fire Emblem - That would be Bryan, definitely. The backstory I came with for him as well as his character just really grabbed me (the fact that this guy sucks at keeping secrets especially gets hilarious). And he gets a crapton of development. He goes from a weak, lonely, and hated crybaby to one of the most powerful, brave, and respected people in the continent of Altarais. One can feel bad for him too because of all the shit he went through as a kid and the fact that he never knew a single thing about his mother for the longest time. He's pretty cute too! I have to mention Leyon as well though, cause of his badassness and how he works to go through life without any family and not knowing what happened to his missing brother, or if he's even alive. He's VERY nice on the eyes too, probably my most attractive OC. :D
Zelda - Kelli is quite amazing and badass, but I've been liking Judo a bit more. He won't appear in my current Zelda fic, but he will have a main role in the sequel, and what we learn of him there is mainly why I like him a lot. ;3