Fire Emblem Three Houses: students
By far the largest category. At the beginning of the game, these are teenagers who are between 15 and 18 years old, but you will not be able to start a romance with a student during their time at the academy. It will be necessary to wait for the second part of the story, 5 years later. Then, their appearance and temperament can change, sometimes in a surprising way.
Let us remind you that the majority of students can be recruited in your home regardless of which one you choose. The leaders of the houses as well as some students (their nearest vassals?) will not be recruited. It will be necessary to meet certain skill or even relationship requirements to recruit students from other houses.
Finally, all these characters will be playable on the battlefield, but probably not on the same campaign.