Destiny is a 10 year journey. So since there is a possibility we may get to keep our character throughout (nothing confirmed) I was thinking...
What if our character aged over the years, like actually grew with us?
EDIT
This doesnt mean you'll be old and and useless, we're talking your character aging from 20 -> 30 years old.
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They could do it like Fable 2 where every time you die you get a scar. That would be cool, but aging I'm not really on board with