Yagen Toushirou

Background
Yagen Toushirou is from Touken Ranbu and appears in the game, Touken Ranbu: Hanamaru (anime), Katsugeki/Touken Ranbu (anime), Apocrypha: Honnouji Temple Ablaze (stage play), and Touken Ranbu The Movie.

Hanamaru
"A tantou made by Awataguchi Yoshimitsu. One of the Toushirou brothers. The origin of his name comes from the stone medicine mortar that he cut, earning the reputation as a sword with "an extraordinary cutting ability but will not kill its master." Because he's raised for the battlefield, he has some medical science knowledge."

Katsugeki
"A tantou (dagger) made by Yoshimitsu Awataguchi. The name comes from its reputation as being "sharp enough to cut through a Yagen (Japanese stone grinding tool), but never cutting its owner." A Sword Warrior with a calm personality, he's experienced and dedicated to his missions."