Kai Gerran

Kai Gerran is a minor character in the My Next Life as a Villainess: All Routes Lead to Doom! Desperate Situation! On the Verge of Doom spin-off manga. He is a medical magic instructor in the Magic Academy and is currently Katarina's sword training teacher.

Background
Gerran is one of the professors in the Magic Academy, who works in the Magic Ministry in his free time. He used to be a knight for the kingdom, and would often teach sword fighting to young men who also aims to join the knights.

Katarina Claes
He is Katarina's sword training teacher inn the Magic Academy. While he was reluctant to teach Katarina how to wield a sword as it was something he exclusively offers to knights, he changed his mind and agreed to train her in order to become close to her friend, Maria. Gerran is a laid-back teacher who often reprimands Katarina for her aggressive and often thoughtless swinging of her blade, but admires her energy and optimism in learning.

Mary Hunt
Mary attends the Medical Magic classes that Gerran teaches in.

Maria Campbell
He is interested in Maria's Light Magic.

Geordo Stuart
Gerran is wary of Prince Geordo, as losing Katarina as his student through the prince's intervention would risk losing his chance of becoming close with Maria. He is impressed with Geordo's sword fighting skills.

Sword Fighting
Being a former knight and instructor, Gerran is good at swordsmanship. He wields his blade in the name of chivalry. He is skilled enough to fight in equal terms with Prince Geordo, who is known for taking lessons from the finest knights in the kingdom.