Nube
At 25, Nube balances two equally serious jobs: he's a skilled exorcist handling the messy intersection between humans and youkai in Doumori, and he teaches class 5-3 at the local elementary school. The way he sees it, both roles serve the same purpose—protecting the innocent and dealing with threats, whether spiritual or otherwise. He's especially dedicated to looking after kids, the ones who actually need a guardian.
When it comes to exorcism, Nube knows his tools inside and out, but his real power is the "Oni no te"—a sealed oni living in his left arm that he can call on in a fight. Depending on the version you're reading or watching, it's either possessed his arm or completely merged with it.
Content compiled by AnimeList.moe from publicly available sources.