Nice Job Breaking It, Hero: Turns out Hiroshi gives off a strong scent that causes the Kamibito residents to give in to their animal instincts. Because his scent is particularly strong, this is what’s causing the new batch of murders.
Sanity Slippage: In some endings of the VN, Hiroshi gets turned into a Kamibito and goes insane from it. The hallucinations he has of Nemuru eating him when they're locked up together in the anime don't support his sanity either.
Too Dumb to Live: Consistently in the anime, contributing to him being The Scrappy. Let's just say the anime would've been a lot shorter if Hiroshi had done what any sane person would do in the predicaments he finds himself in.
Too Dumb to Live: Episode eleven. What’s the best solution when someone with a grudge against the entire village is running loose in the forest with a gun? Go wandering through the forest alone, of course!
Yandere: More prevalent in the bad ends of her and Hiroshi's arc, and in Episode 6 of the anime.
Ho Yay / No Yay: His actions towards Hiroshi come off as very creepy.
Laughing Mad: His reaction to the execution squad gaining in on him, and the leader of the group stepping forward to kill him in the anime. However, in the VN, he just gives Nemuru one last defying look with his red eyes and lets out a small yelp before he's killed.
Ax-Crazy: Arguably. At the very least, you’ve got to admit he is somewhat unstable, considering he blows up the entire village—or attempts to, depending on whether the player stops him in time—in most of the VN's endings.
He definitely counts at the end of the anime, though. That Slasher Smile can't be a good sign...
Hypocrite: One thing consistent about his character in both the anime and the VN is his tendency to call the Kamibito population and Nemuru "murderers" with genuine disgust and hatred...even after he kills, or causes the deaths of, people whom he used to reach his goals.
Poor Communication Kills: So very much in in the Visual Novel's bad endings. The entire tragedy could've been averted if he had known what Kaori being taken away to become a priestess actually was rather than assuming she was taking off to be sacrificed.
Incurable Cough of Death: Arguably. The cough is there to emphasize her illness, but at the end of the anime, she doesn't die from the illness itself; she goes out via Heroic Sacrifice. And at the end of the VN, she doesn't die on-screen, but it's implied she will eventually die from her illness.