I have an idea for a little story where two superheroines fight to settle a rivalry about their places in their superhero team. The story itself is fine for what it is, but it seems that it's impossible to find two good superhero names when you need them. There must be hundreds of thousands of published superheroes, and they must have taken almost all the good names by now, along with a big chunk of the bad names.

I was hoping to create two original superheroes for the story so I'm trying to not get them confused with existing superheroes by sharing the same name. Unfortunately that is surprisingly difficult.

Circumstances may force me to turn the story into fan fiction about existing superheroes, simply due to shortage of original names. To stay true to my original idea, they should both be female. One of them should be a young fresh recruit to the team who impresses the team with her enormous powers, friendly attitude, and very large breasts. The other one should be a team leader who is significantly older, more mature, less powerful, and feels insecure about her position on the team with the arrival of the newcomer.

Does it make any sense to try to find existing superheroes to fit those roles? Or would it be easier to come up with original names and just invent the characters for the story?