Yagen Toushirou (薬研藤四郎)
A Sword Warrior with a calm personality, he's experienced and dedicated to his missions (Source: Touken Ranbu Wiki)
Animeography
Katsugeki/Touken Ranbu
Touken Ranbu: Hanamaru
Zoku Touken Ranbu: Hanamaru
Touken Ranbu: Hanamaru - Makuai Kaisouroku
Toku: Touken Ranbu - Hanamaru - Setsugetsuka