If you read the criteria for this challenge again, it says
"In this challenge, challenge yourself in creating your very own serial adventure hero in this style!"
Meaning you couldn't enter a character that already exists anyway.

Hope it stay's this way, I'd personally prefer it wasn't a mix of newly made characters, and one's that already exist, like a couple of the challenges have been changed to part way through.
One or the other is fine, but together seems a bit too un-categorised for me.

Just my opinion though!