(Hope you don't mind me tossing a pair of ideas into the ring while I hammer out a story for one of the students. ^_^ )
Miss Lottie Dectus— Spiderfolk, her, 6’7”, 144lbs., 22 y/o, English Teacher
Fresh out of school herself, Lottie is the newest teacher to join the illustrious ranks of the teaching staff at Arcana High. The first of her brood to graduate from higher education, she's an incredibly hands-on teacher, making up for her inexperience with oodles of prodigious talent and book-smarts, and always ready to lend a hand or six to a friend or a student in need.
-Tall with six spindly arms, coated in jet-black fuzz with red highlights. Despite her venomous fangs, beady black eyes, and rather frightening appearance she's as sweet as pie and more then a few brave students fantasize about her shapely hips and chest.
-Always dressed to impress in fashionable silk blouses and trousers, usually in bright colors to offset her spooky appearance. Rumor has it that she "makes" them herself, which is of course utterly ridiculous. Right? Right???
-Her family comes from a long line of bakers and chefs, and she likes to bring in baked goods and treats for her classes. What the hell is an undertale?
Miss Viken Bravehorn—Minotaur, her, 7'7, 350lbs, 32 y/o, Science Teacher
Hailing from a small village on a Mediterranean island, Miss Bravehorn struck out for Monster City in her teens, in search of a better life outside of being a farmhand or a goatherd for the rest of her days. She still has a bit of the old country in her and she looks and acts about as far away from being a scientific mind as you can possibly get, but looks can be deceiving. After all, how many of you could explain the theory of relativity with a story about a runaway cheese wheel and an angry goat?
-Big and bulky, with a rack that makes the girls jealous. She's a little chubby thanks to easy city living, but she's still quite tough and strong and could probably lift a car if she wanted to.
-Wears traditional jewelry from her homeland in addition to her smart suits and lab coat.
-Has a reputation for throwing caution to the wind and performing all kinds of dangerous scientific experiments for her classes. Somehow, no one's been hurt so far.