Certainly that appears to be standard. There is probably some vestige the classic “team makeup” system that caused that.

In the long long ago, girls didn’t have their own superhero books. They were mostly part of teams that were aimed at boys. The makeup of a team is as follows:

• The leader,

• The strong guy, The cool guy, The funny guy, The smart guy (choose any 3, of the 4… if you want all four, make the leader a smart guy)

• The chick who dates the leader (or maybe is torn between dating the cool guy and dating the leader, but ultimately we know she’s going to end up with the leader)

Since the chick’s ultimate goal is to fall in love, her powers are often tied to her emotions. They can go out of control whenever she is emotionally confused etc.

Formulaic storytelling at it’s best.