Something I've been thinking about recently has been, when does making an OC make sense? If you know me well enough, or if you know any of my friends on here, we're a bit OC trigger happy, and by that I mean, we like making OC's. But there are times when I see someone making an OC and I just sit there and think, why?
Allow me to clarify a bit. To me the best universes in which to create OC's for your favorite shows are the ones with a big enough, or a broad enough universe. Take Fairy Tail for example. It's established that there's hundreds if not thousands of wizards and hundreds of guilds in the kingdom of Fiore, couple that with the multitudes of different kinds of magic and you've got a universe that's easy to create your own character for it. However there are also series that are restricted to the point where putting in an OC would just seem weird, awkward and unnecessary.
Another thing I feel about OCs with is that they're all, in a way, a part of their creators being. We all can agree that more often than not, creating an OC comes about from our desire to fulfill a wish to be in a show we're watching and enjoying. For example, the first OC I created, Jaden Evans, came about because I've always wondered what it'd be like to be in Digimon and to have a Digimon of my very own. Then there's the part about our OCs being an extension of ourselves. I doubt anyone can say they haven't had any part of at least one OC they made not have any part of their character's background or personality be inspired by something about themselves.
At the end of the day everyone have to admit that their OCs are essentially them in the anime they wish they were a part of.
Listening to: Black Bullet OP
Watching: Black Bullet
Drinking: Diet Pepsi