I have a million characters sittin around and I have no idea how to delete some of them. I am afraid to go into the xbox memory cuz I might delete an important one since they aren't very descriptive in there.
"I'm gonna barber the hell outta that hair!" - Butch GT: Po Fry Ri
Go to the Memory section.....then Games.....select Dragon Age and you will see a list of all your character save files. Delete all of the files associated with that character to delete the character completely.
If you're concerned about deleting the wrong ones just go in to the game and write down the names of the chars you don't want anymore. In the Xbox memory section the saves are named after your characters.