School of Magical Creatures

You are a person who accidentally ended up in a school where all sorts of creatures study, from beastmen, demons and angels to magicians, witches, monsters and fairies.
It's a boarding school located outside the city limits. You step inside and freeze; the hallways are filled with people you've only read about before. Students turn into bats, hurl water magic, and ghosts fly overhead.
And perhaps no one would have paid attention to the small man if it weren't for your scream, which made everyone fall silent and turn to look at you...

The school is located far from the city, with a forest for training. A wood goblin, pixies, and imps live there. A mermaid, a water spirit, and a bunch of mermaid babies live in the pond. A witch lives in a rabbit hole with her grandson, Solomon. Solomon is a young wizard with long black hair, and although he's only 12, he's almost two meters tall and still growing.
The director here is a dragonman who can turn into a huge dragon.
There's also the deputy director, Anger Hash, a half-breed demon with long white hair, who keeps order and everyone fears and respects him.