Thymilph the Crasher is the first of the Spiral King's Four Divine Generals introduced in the story, representing the classical element of fire. He is Viral's initial superior officer and the commander of the Human Eradication Army Eastern Branch, which he monitors from the deck of the land battleship, the Dai-Gunzan. He is good friends with Divine General Adiane, though General Guame insinuates he had a closer relationship with her. He is a skilled tactician and proud warrior, and was ultimately killed when Kamina and Simon destroyed his personal Gunmen, the Byakou, with the Gurren-Lagann.

Thymilph appears as a stoud but large, well-built imposing armored warrior with gorilla features. He is impressively strong, almost always seen as in the company of a large iron hammer he presumably uses in close-quarter combat. A seasoned and confident war veteran, Thymilph has a high respect for caution and shrewdness, but like Viral, possesses a warrior's code of honor. Guame implies that Thymilph was idolized by many Beastmen throughout the Beastmen Empire.

Thymilph's name is based on the DNA chemical thymine and the elemental Sylph. His Gunmen, Byakou, is based on the mythical White Tiger, Byakko.