Just had a thought for an interesting character:

Bipolar Techbane

A character that has the mana static minor talent, but can only use it in her manic phases.  When she is 'depressive' she keeps a stoic attitude useful for dealing with intimidation and a whole lot of other social and mental situations, but lacks the motivation to do very much.  When she is 'manic', her mana static power is active, and almost out of control, plus she is capable of running circles around opponents in a fight during a manic phase.   

I figure this character would have all kinds of compels and invokes associated with the aspects dealing with her bipolar disorder.  It wouldn't be too hard to make a couple of stunts to give some mechanics for how the character manages the bipolar-ism (make them roll a check against discipline to see if they can get out of a manic state, for example).