An isolated girl is just herself, but put her with two other girls and let them reach their ground state and they will through spontaneous symmetry breaking form the Beauty Brainsand Brawn
trope or in groups of two the Tomboy and Girly Girl
or other pair tropes, because they're quarks.
Guys are leptons and so fall into the Five-Man Band
to match the s,p,d,f atomic orbitals. (The Chick is a hadron as above.)
Stories are about conflicts and so tend not to be in the ground state, but the ground state can be imagined as either what happened before the story or what will happen afterwards.
War is education by other means. Success depends on the proper selection of tropes for the narrative.