Decidueye is the nerdy girl with glasses that is secretly a turbo-slut. (Rowlet was when she was fat before losing weight due to starving herself, Dartrix was her emo phase).
Incineroar is a tough bully type that gropes girls in the hallways and give people wedgies. No one stands up to him because he's so intimidating. Really he is a harmless but annoying dumbass.
Primarena is the popular girl who has tons of fake friends and few, if any, real friends. The few people who she's opened up to know she is dying inside and puts up the façade so no one worries about her.