Yahito Takigawa

Yahiro Takigawa as he first introduced in his human form to Basara and the others, but his real name is Lars. He is a demon who worked for the Moderate Faction as a double agent among the Demon Lord Faction and was sent as the observer for Mio Naruse under the guise of a student in Hijirigasaka Academy. Throughout the series, Lars has shown different personality traits in both his human and demon aliases. In his initial encounter with Basara, he has proven to be friendly and outgoing, being quick to befriend him after being immediately hated by the male students on his first day due to his connection with Mio and Yuki. Despite that he decides to befriend Basara, Lars never hesitates to leave him behind when Basrara gets caught up by the fans of Mio and Yuki. Under his true identity as Lars, he has shown to be ruthless and cold-hearted as he attacked Basara, Mio, and Yuki on multiple occasions as the "Masked Demon", even having one of the demons under his control stab Basara in the back. However, his cold-hearted side was due to him maintaining his cover as an undercover agent inside of the Demon Lord Faction, which was noted as he had one of the Shadows hit Basara in a non-fatal spot. Throughout his conversations with Basara, he is noted to be fairly lazy and complains about his ever-growing workload over the course of the series. When it comes to school work, Lars often just uses magic in order to finish his assignments or pass exams since it doesn't really impact him. Even in life-or-death battles, he's often seen complaining about the opponents he's tasked with fighting against. Similar to Basara, Lars can be even more ruthless if someone that's targeted is someone important to him as noted when he developed deep-seated anger towards Zolgear who murdered Mio's foster parents (the two people he looked up to as an older brother and sister figure) who took care of him and other orphaned children like him.