Hidaka Ichina

A jinyou working in the 17th Jinyou Pursuit Organization under Iizuka Kaoru's command. She's the swift-runner type. Basically when she's fighting, she completely loses the sight of everything else. If her older sister, Hidaka Reina wouldn't back her up, the damage she can cause would likely expand to dangerous levels.
When she

Spoiler

was a child, her abusive father's mistreatment has resulted in her having a cruel heartless personality. Before she joined the Dominion she made herself a name as a famous serial killer committing bizarre horrific murders.

Her youkai ancestor is a youkai species kalled Kasha (traditionally, messengers of Hell, fiery monsters known for causing typhoons at funerals to bear the bodies of sinners back to the underworld), and thus she can create devastating firestorms using her powers she inherited.