His name was Rein, and after being raised and trained by Rina's parents, he became their guard when the monsters arrived. He wasn't that good at magic, but his physical strength was way above the normal elves, and he also was pretty skilled with the bow. Still, when he faced the fire overlord, he didn't have the power to do anything… his loyalty was borderline madness, that was why he decided to do such reckless and unreasonable things.