Attribute type

There are 4 attributes in the game. A girl always has 1 of these four as a preset weakness. The girl's weakness can be seen if you navigate to her in your Unit Menu, it is the small icon directly below your girl's weapon.

Purple (lightning): Special

Yellow (explosion): Ammunition

Red (fist): Fighting

Blue (laser): Beam

You cant change your girl's weakness. You can, however, change her attacking attribute, by changing her weapon.