I really like the idea.  I thought Darwin had an awesome power set in the movie and was sad to see him go.  I think there's a lot of potential for such a character and it definitely sounds like you're going to go out of your way to make his power also his weakness, which I always like.<br/><br/>As far as the power being too amazing, I plan to play a character who can shrink to an inch in height without any adverse reactions.  With that in mind, I think your character will be just fine.   ;)<br/><br/>I have to admit I'm eager to see everyone else's character sheets and very eager to begin playing.