One of my friends came up with a character who could easily be described as "Two-Face meets Legion". Has a split personality (though not in looks), but they both have different powers (the main ID is electrical, his "brother" is a low-level Powerhouse [Doc Samson range]). He's got the character's look pretty much stabilized; the "trigger" for the other guy to come out, he's still trying to figure out.
The thing is, how do we go about writing up this style of power? I thought of just going with Alternate Form (electric wielder; Alternate Power: Alternate Form [bruiser]), but now I'm thinking I should just do two different character sheets. Any suggestions or ideas?