Doji was a tricky demon who loved making trouble. Every one here knew his personality and his habits of doing the most dangerous and unexpected things, compared to him, Taki wasn't considered all too innocent but the kind of trouble the two caused was far different from each other.
Doji would go around fighting ghosts and demons, making them submit to his authority. He was what you'd call a bully and the only people who didn't know this side of him were the demon king and his brother Taki. He would act innocent in front of his father, and his brother was never here so he was naturally unaware of this demon's bully-like personality.
Taki was not innocent, but compared to his brother, he was still considered somewhat better since all the troubles he caused were in one way or another related to the human realm such as the current trouble he caused which was just dating a human.
It was clear who the suspect was.