I didn't have this dilemma so much because I loved my main character. I made other ones but I never really played them and they never reached max level. So when the time came to create my first hero I went for the very same one but as I was finishing the costume (which I still knew how to complete just off the top of my head) it felt old and classic. So instead of creating a new one, I just changed his look a bit and gave it a more modern touch as if 6 years had passed since the last time he was seen. My old char now has a beard, looking more like a man and less like a boy and the classic "around the eyes" mask was replaced by modern looking lenses. The rest remained pretty much the same with a little retouch here and there (what was yellow is now more golden, the oval belt buckle is now square). To everyone facing that dilemma I think you should try that trick: designing how your character would look 6 years after the last time he was seen. Maybe nothing changed, maybe he got new gadgets, maybe he took on a darker look because something bad happened to him... roleplay it even if you're not into RP ;)