“LIES!” you say. “How could you even think such a slanderous thing?!” Well ok, I might consider it. But here’s why I’d rather have my own character in an original videogame.
You can’t make him dance
You’re using someone else’s pre-made character instead of your own. That character comes with baggage: his own ways of doing things, his own quips, his own reasons, his own backstory. It would be like playing D&D with someone else’s character. “I want Broahan the Wise to slit that Goblin’s throat.” “What? You can’t do that! Broahan the Wise would never do such a thing!!” This already used, already established character has a certain way of doing things, and there’s no way you can change that, because that’s what defines the character.
This is also the reason why people say Batman is the least interesting character in the story. Batman will never go over the edge and murder someone, he’ll always have his parents killed and have a need to avenge them, he’ll always have the need to dress up like a bat, and he’ll never say, “Nah, I’ll take a break from crime fighting tonight. The crooks can arrest themselves.” And to meander from these traits would not be Batman. How could Batman not be Batman? His villains, on the other hand, have a little bit more leeway, and the game/cartoon/movie/comic creators always have the opportunity of creating a new one.
Everyone will hate you
Why did we all hate Spider-Man in Spider-Man 3(Let’s not get into the fact that they had too many villains with too little screen time)? He was acting the way Spider-Man would never act. Peter Parker would never strut down the sidewalk provocatively. Peter Parker would never break into a jazz number. Peter Parker would never do a sassy hair flip at J. Jonah Jameson (No seriously, WTF Pete?!). Peter Parker would never kiss another random girl when he’s already dating a super model. Wasn’t that what you were thinking when you watched that? They messed with an established character.
Now, if they had made a film about Super Duper Arachno Man©, all those things could have been believable because it was a new character. In fact, if they had gone that route, all those things could have looked like they were mocking the established character of Spiderman, as Kick-Ass did so wonderfully.
It’s all been done before
Characters like Spider-Man and Batman have been around a long time, so any “new” idea you may have for that character(that would fit with that character and in that universe) has probably already been done before. He’s had a girlfriend, he’s been married, he’s had his unborn child murdered, he’s been in an alternate reality where he does have a kid, he’s had clones, he’s has secret robot parents, what more do you want to do to the poor guy?
Make your own character
You don’t want to write fan-fiction all your life, do you? By making your own character instead of using an already existing one, you can make him richer and fuller than any pre-established character. Don’t make an exact carbon copy, just enough to pay some homage. Give him enough unique touches to make him an interesting and rich character. Maybe Super Duper Arachno Man© is a huge tool and gives everyone a sassy hair flick because the Super Duper Archno Radiation© that gave him his powers also gave him incurable cancer and he has to get in all the sassy hair flicks he can! Interesting yes, but could you ever see that as storyline for Spider-Man? No. Which makes it even better in a game or animation, you’ve just made something unique that no one else could have seen coming.
Super Duper Arachno Man©2010