Hijikata Toshizou, 28. Vice Commander of the Shinsengumi, also nicknamed Oni no Fukucho, or Demon Vice Commander. Earned this name for his strict ways with his men, though he has their best interests in mind when doing this. Most of the time he's informal to people, friends, strangers, or enemies, but will attempt to be formal with people above him and keep quiet, up until he's had enough that his anger and irritation flares up. Other times, he acts aloof and rational when making decisions, but quick in rapid-fire arguments. 

He will do anything for the Shinsengumi and to make Kondou's dream a reality, even keeping secrets or truths from him if he has too. Hijikata does have a range of emotions when speaking so he will be changing from yelling to quiet often depending on his feelings or situations.

His voice is medium deep, rough, with a wide range of volume. It's recommended to listen to Miki Shin'ichirō original performance as Hijikata in Hakuoki proper, or other versions of Hijikata to understand how he acts and sounds. 

I was also told he is a younger version of a grizzled veteran. (Hijikata-san this is why Souji calls you a Mother Hen)