Well, it has to do with your appearance, just like Well Endowed and its descendants do.

So the impression I got was that Well Endowed was about whether you are curvy, and Size Difference was about whether you are Ant Man.

Is Ant Man by any chance very small?

Being curvy is an effect on your body type; being tall or short is also an effect on your body type. I think it makes sense.

I see...Ant Man is a superhero who has the special power that he can shrink and grow a lot at will. But tiny Ant Man still looks the same as big Ant Man, just, against a differently-scaled backdrop.

Size Difference can change your body type more than that; taller people and shorter people aren't differently-scaled versions of each other, they have different bodily proportions. I think Size Difference can also do the scaling version, but I think most people who want to be very short or very tall with it want their bodily proportions to achieve a certain look that's different from the scaling one.

I see! I totally misinterpreted it, then. I guess I will just have to come up with more interesting drawbacks. 

You've had some pretty great ideas so far; I bet you can come up with more!

Thank you! --Oh, I just had an idea for a drawback that isn't related to Sexy Villainy at all. Not specifically, anyway.

Oh? What is it?

Remember how much I didn't like Not Like Other Girls?

I do remember that.

So the idea I had is--the opposite of that. If someone is prejudiced against a group I'm in, they can't except me from it; if they want to reevaluate their opinion of me, they'd have to shift their whole attitude towards the category.

Hmm. I see what you mean, but... are you sure you want to have that effect on people?

Can you describe the effect this would actually have better?

The way you describe it, when I think about how to build the drawback... it would mean that someone who might otherwise like you, but who had trouble with something about who you are, would always see you through that lens the way they'd see a stranger. And I'm not sure, but I think... I think that might be backwards from what it sounds like you want? It sounds like you want people who get close to you, but have trouble with something about who you are, to need to reconcile the fact that they like you with the fact that they dislike something about you, and come to understand that they shouldn't really dislike that thing in other people. But if I built it that way around it would be a power, not a drawback. The drawback version I think mostly just makes it harder for people with that kind of problem to get close to you in the first place, unless they don't know that you're someone they dislike in that way.

Sigh. 

No, you're right. I was hoping that because it was the opposite of a power that exists, I could make it work as a drawback. 

That makes sense! I think it was the kind of idea that's good to have, and it just didn't work out in this case.

Well, if the notebook thought it was a good idea...

She goes back over the list. What else was actively undesirable...My Ears Are Burning doesn't have an obvious opposite, neither does Agree to Agree--or, well, that one does, but the opposite isn't anything she'd want to touch either--no, no low hanging fruit there. Although, looking at the list again:

Does Like Roses count as an appearance power?