And I Must Scream: While under Kotaro's control, his victims are fully conscious as their bodies are under his thrall.
Bowdlerise: In the original Japanese, before he enchants Moka, Kotaro outright tells her, "I want you to be my slave". In the dub, he tells her, "I want your love, to take it prisoner" (which gets the point across, albeit in a less explicit manner).
The Casanova: While Kotaro is sexy enough on his own, he has also a Compelling Voice similar to Kurumu's Hypnotic Eyes that gets every girl in school—even the vicious Kokoa—to swoon and obey his every wish.
Compelling Voice: All Kotaro needs to do is say "Je t'aime" and anyone within earshot is enthralled by him, not unlike Kurumu's enthralling abilities. While it's most effective against women, Ginei also falls under it, and he has to use it on Kokoa multiple times before it sticks.
Kotaro's grip on the girls can be read as a subtle allegory for abusive relationships in general. He charms them with his good looks and flattering words, those words phrased in a way that sound appealing but are revealed to be sexist if thought about for much longer (like when Kotaro wants Mizore to smile for him or for Kurumu to be vulnerable for him). Once he has his hooks in them, he forces them to divorce themselves from other people in favor of his company, and "punishes" them if they defy him.
As Kotaro's harem increases, their affection for him turns fanatical. They all start wearing uniforms not unlike the Public Safety Commission's, start referring to him as "Master", want to be punished if he thinks they defied him, and viciously attack anyone who tries to break them free — not unlike how a lot of cults work.
The Dog Bites Back: After being used like a slave and a stress-ball by Kokoa, Kotaro gets his revenge when he manages to charm Kokoa and take control of her (not after trying a few times at least).
Epic Fail: When Tsukune is about to do the field jump, he bangs his head on the pole. Mizore is still impressed, admiring the way he "bite[s] the dust."
I Coulda Been a Contender!: The episode begins with Deshiko Deshi - a former member of the Public Safety Commission - being chided by other girls, having lost all of the respect and notoriety being a member got her.
Kick the Dog: For seemingly no reason, Kotaro's first interaction with Tsukune is to grind his foot, then wave it off as his feet being too big, Foreshadowing that he already knows who Tsukune is and doesn't like him.
Laser-Guided Karma: Deshiko Deshi, like all other members of the Public Safety Commission under Kuyou, constantly abused her authority and made the other students' lives as difficult as possible For the Evulz. Come her reappearance in this episode, a year after Kuyou's defeat, she's been reduced to a sad, pathetic girl and a target of ridicule for the very same student body she used to victimize.
Lethal Joke Character: Kotaro Ijuin is revealed by the end to be Kou, the bat who regularly provides exposition. This means that he could have taken human form and mind-controlled the entire school the whole time and only decided to do it now.
Monster of the Week: Kotaro Ijuin, an exchange student who has the power to enthral all of the women in the school with a glance.
Oh, Crap!: Kotaro has this reaction when he notices that Tsukune managed to get the rosary off of Moka.
Sexophone: Kotaro's theme song involves an incredibly sensual Jazz number, often whenever he is framed in a Crush Filter to hammer in his sex appeal.
Take That!: Kotaro is arguably one towards fanfic writers who often create OCs (If not self-inserts) designed to humiliate harem protagonists like Tsukune and steal their girls from them.
Villain Song: Later in the episode, Kotaro sings "Je t'aime" to a mind-controlled audience with mind-controlled back-up dancer. While it has the lyrics of a love song, really all it is is him splurging on his power trip.
