Don't take too long to think about it - list 15 fictional characters who've influenced you and who will always stick with you. (Emphasis: influenced.) List the first 15 you can recall in no more than 15 minutes. Tag your friends so people can see who you've chosen and play along...
The Big Three (Captain Kirk, Mr. Spock, Scotty ... sorry Doctor McCoy!)
Conan of Cimmeria
Gandalf the Grey
Toad of Toad Hall
Robin Hood (mostly in the form of Errol Flynn)
Lon Chaney's "The Wolf Man"
...unfortunately, time ran out. But even if it hadn't, there aren't that many more I can think of who've had a lasting influence and "will stay with me." Lots of short-term enthusiasms, tho...