I'm gonna share info about some of the characters that have been introduced in the novel:
Jin-hyuk (he/him): He's 5"5, almost as short as Ryan, but at least Ryan actually has short parents, while Jin-hyuk doesn't. Jin-hyuk will go feral if strangers make fun of his height. Plays guitar in his free time. Is the head magical boy of the Sun Kingdom.
Ike (he/him): This boy is 5"9. Wait till he meets the other main character, he'll feel t i n y. Is also Ryan's biggest supporter in his transition. (He actually gave Ryan his school pants because Ryan's parents would make him wear a skirt everyday) Is a magical boy for the Sun Kingdom.
Ryan (he/him): He's 5"2, which is my height. No one would ever dare to make fun of him though because, like Jin-hyuk, he would go feral. He is the reason why kids at their school are scared of people under 5"6. He's also one of the more popular kids, since he's on the volleyball team. Is a magical boy for the Sun Kingdom.