Good job but there are more than four... If it were up to me, I'd make it a team of four consisting of Kim Possible (For the brains), Juniper Lee (For the superstrength) , Starfire (For the comedy), and Raven (For the serious).
Kim and Juniper Lee could also be ground team to battle ground creatures and ghosts as well as laying out the ghost traps while Starfire and Raven could be air support for flying creatures/ghosts and really huge creatures/ghosts.
So all in all, the perfect 4 for battling the things that go *BUMP* in the night whether they be ghosts or what.
The rest of the girls could be Ghostbusters in training or Ghostbusters West (like the Titans have East and West versions)