So, I'm not sure how big the master list of story paths is in the game already... and yes, I know that there's not certainty that the whole "choose your own adventure" thing WILL happen.... but I had an idea for one.... and other's might too.

Cult leader:
Basically it begins with you getting your first follower, and as you adhere to it, you enslave the hearts and minds of the populous to your will with your powerful charisma or might....

also

The Paramour
Jilted by your romantic flame, you got out to make a name for yourself as a great hero/villain and greater lover! (this would especially work well for the grey-area types...... cause who doesn't want to be a scoundrel? :P)

and

The Legacy (I)
your parents were heroes, maybe even your grandparents... now it's time to take up the family name... for good or for awesome.

The Legacy (II)
After the last fight with his/her nemesis, your mentor is finally taking his cape off.... and putting it on you.