Immortal is a bit much, I think.  'Very long-lived' would be fine.  

The Omnipotent Sphere, would you wanna be a Band member?  I'm hoping to have 4 or 5 besides myself.  The original idea was that my character would found (but not necessarily lead) a Band that much of the story would follow.  If enough people are interested we could have multiple Bands going at once.