Zelgadis is a really great character. He’s a skilled swordsman as well as a bit of a sorcerer. He had wished to become stronger. His wish gets granted at a cost, which turns him into a chimera (part human, part demon, part golem). Although angry about these turn of events, he does put his new-found strength to good use to aid his companions, all while seeking a way to eventually turn back into the human he once was.
The most serious character out of the main group. But if anyone knows Slayers, nothing can ever be serious for long. Zel puts up with a heck of a lot of stuff, I commend him lol.