This is a stab in the dark.  Just thought I'd fuel some creative juices.

Imagine a man who is a playwright and actor.  He is the most gifted writer in the last century, and hundreds flock to see his plays.  During the performance of his life's work, a terrible tragedy occurs killing the playwright as well as all his actors, and all the patrons.  From the ashes of the tragedy, he rises maniacally laughing.  Realizing that his form is disgusting and decayed, he can no longer find an audience that is willing to watch his plays.  Oh the irony!  He dons the masks of tragedy and comedy, and is fueled by the search to find an audience willing to see his grotesque works.

This character would be a general type demigod.  He would summon minions from the creations of his plays, or patrons of his shows.  He would have two forms, similar to Torchbearer.  The forms would be: Tragedy, and Comedy.  Each has its own skills, as well as its own summons.  Tragedy form focuses on mezmerizing attacks, while comedy is focused on friendly burst buffs.

I leave this as a very general template for anyone to change or expand on.  I figure there has to be some subtley to creating demigods.  You can't just say, lets make a demigod similar to zues, or poseidon. 

Also, I forgoe my rights to this idea in any way shape or form, and allow anyone else to adapt or steal this idea as they see fit.  LOOKING AT YOU STARDOCK!!! LOL