Supernatural The Animation, Ao no Exorcist Recommendations
Both series are about a pair of brothers fighting against demons. The older brother Dean is more the action kind of guy, attack first, ask questions later, which is like Rin. Sam the younger brother is the more reserved thinking brother. Sam also is very smart and tends to use research and intelligence against enemies rather than brute strength like Dean (though they both kick some serious ass regardless). This is quite a bit like Yukio. In Supernatural one brother also shares a strong connection to demons and Lucifer (Satan) in particular (not going to give away which one). The other brother often tells his
two brothers (twins in Ao no Exorcist, just brothers in Supernatural) fighting against supernatural powers, demons and main villain - Satan (Lucifer) and one of the brothers is a container for Satan (Lucifer). In Ao no Exorcist are exorcist, when in Supernatural we have hunters. in both demons can posess human body and when thay are "kicked out" of it, they come out as a black smoke from the mouth.
2 brother who hunt supernatural beings
a father who teaches them to do so
they share much more things, but i would be a big spoiler for supernatural (google sam + devil if you want to know)