My headcanons-

Kevin is trans (FTM)
He got top surgery (in a painful way too..)
But has not have bottom surgery (this is the old times they didn't know how to change a pussy into a dick ok)
He has some hair on his chest, arms, and legs.
He his skinny till you get to his hips. He had wide hips and some nice chubby thighs too. He had some scars from fighting or sh (Self harm).
His hair is kinda long. It stops at his shoulders.
His mother forces him to wear dress to show the kingdom he is still a girl. His father lets him wear whatever he wants when they are training, hangout, when his mother isn't around, and in his room. His father helped him get top surgery. (by just taking a sword and cutting his chest area then sewing it back up.)
He is a prince. His father is the king and his mother the queen.
His relationship with his mother sucks. She sees him as a girl still and wants him to be her beautiful daughter. But with his father, he has a great relationship with him. His father trains him and sees him as his son.
He does have a brother. His brother is the captain. The captain is a knight. Kevin rarely sees him because he is always training and out fighting with other kingdoms. But they have a good relationship too.

Rick is bisexual.
Rick comes from a poor working family. His family always try's to cheer him up or hoping that he would give them some type of emotion but rick never seems to change his face expression. Rick works hard at his family farm but does quit sometimes when he is tired and not wanting to do it anymore. He knows Kevin from the bar he saw him at.
He is hairy all over man. His chest hairy, his arms hairy, his damn legs hairy. His hair is the same length lol.
He has one sibling. It's patty. Patty goes to the hospital (or whatever they called it back then) and looks at the dead body's or something like that.
Rick loves cats. He saved a stray cat and kept him as his own. He named his Charlie.
He is friends with Radford and Streber who are some villagers in the kingdom.
Rick relationship with his family is ok. They try to make him show emotion which he try's to do slowly. He loves his family and try's to help out as much as he can. He has the best relationship with patty. They get along pretty well. She understands why he doesn't show much emotion as she doesn't really do either.
He has a bit of a crush on Kevin but he doesn't know what that means in anyways and try's not to make a big deal out of it.
Forgot to put this. Rick is chubby. That's it. We need more big guys like beautiful rick here.

That's literally all I got man.
I might do chapter one later today or tomorrow if I can idk.