To be honest, what I should have done is taken the option of Rare or Involuntary Change and made it into its own power (and made it Involuntary Change). Because the Human Form isn't the emphasis of what I'm taking from the power, it's just the only place where Involuntary Change appears as an option. Which is basically the focus of the character.
However, I suppose it could also be done with three way split as well - Charles Emerson, male, normal. Charles Emerson, male, buff. Charles Emerson, female, fast. And then Human Form would be the first and I could get +2 for both Human Form and Involuntary Change. And the middle is for lukewarm water.