Rapunzel, despite her lack of experience she is good to her people and in the show I believe she still had her healing abilities so that's a bonus. I would defend her. Everyone else can GET THE HELL OUT MY SIGHT.
Princess Bubblegum is a sociopath
Charlie is in hell so I'll pass.
Star is too chaotic
Elsa loses control of her powers EVERY TIME she's in a bad headspace. God forbid she gets depressed.
Princess Peach is always getting kidnapped and having her kingdom either vulnerable to attacks or in absolute chaos without her.
I'm assuming serve like a knight (protection, unyielding loyalty) or maybe a servant (assisting with cooking, cleaning, entertainment, comfortability).