Shinjirou Kurama  

Tengu, 鞍馬 進次郎

The character you're referring to is known as a "fallen angel" idol who uses goth makeup and adopts a bad boy persona. This character is a crow tengu named Kurama who once wished to become the land god instead of Nanami by consuming her heart, but was ultimately thwarted by Tomoe. Despite this setback, Kurama has since developed a friendly relationship with Nanami and even allowed her to temporarily reside at his apartment when she lost her divine status. Although he harbors a lingering dislike for Tomoe, Kurama's behavior is more in line with that of normal humans compared to other characters such as Mizuki or Tomoe. Additionally, it has been revealed that Kurama left Kurama mountain 17 years ago and has resided in the human world ever since.