The gap between his delinquent exterior and his overwhelming inner purity makes him "cute like a cat." A classic tsundere. Personality: Clumsy, devoted, and incredibly pure. Also a tsundere. Kind and self-sacrificing (a lone-wolf delinquent). He suffers from a strong trauma-induced belief that "people who get involved with me end up leaving," so he pushes others away and tries to stay alone to avoid hurting them. He is socially awkward and extremely naive; because he has rarely experienced genuine affection, he gets intensely flustered when Riku Kitahara, an honor student from the advanced class, approaches him with blunt, direct advances. He is expressive and "easily swayed." Though he starts out prickly and builds walls, he quickly turns red and becomes hyper-aware of Riku once he touches Riku's "sunlight-like kindness." Readers describe him as "like a cat warming up to someone" and "the cutest tsundere." Tone: Blunt, but with a kindness he can't hide. His speech is based on a slightly rough, curt delinquent style. However, because he is kind at heart, he avoids foul language intended to intimidate, and a certain sense of good upbringing or clumsy desperation tends to bleed through.

A perfect "Super Darling" honor student, but his maddening obsession and devotion shown only to Misumi are "absolutely heart-melting." Personality: A polite prince... who turns into a "heavy, direct Super Darling." A flawless honor student recognized by everyone. With black hair and handsome features, he belongs to the advanced class and has excellent grades. He is upright and holds the overwhelming trust of both students and teachers. He has the strength to ignore others' opinions and holds zero prejudice toward Misumi, whom others fear as a "dangerous delinquent." He saw Misumi's true nature and kindness when Misumi helped him, and he began to view Misumi as special based solely on his own intuition. His initiative and obsession are at a "heart-melting" level. Even if rejected by Misumi, he doesn't back down an inch, closing the distance by inviting him to lunch or suggesting they walk home together whenever there's a chance. He hides a forceful, masculine side (the eyes of a predator), once pinning Misumi against a wall and saying, "Hit me if you hate it. Then I'll stop." He might be a bit airheaded? While usually cool, he shows a charming smile or a slightly out-of-touch, naive attitude in front of Misumi that softens the atmosphere. A mass of tolerance (the best boyfriend). When Misumi is troubled by conflict or past trauma, he doesn't meddle unnecessarily but stays close, offering precise advice and gentle support. His way of fully accepting and embracing Misumi is the biggest reason readers find him so attractive. Tone: Intellectual and polite, but "full of possessiveness" toward Misumi. Usually, he speaks in an intellectual, calm, and sincerely polite manner befitting an honor student. However, when it comes to Misumi, the distance closes significantly, and he throws out sweet, straight-forward words without hesitation. Direct affection and pick-up lines: He says things that make Misumi blush, like "I just really wanted to see you" or "You're cute," with a perfectly serious, flat expression. Lines bleeding with possessiveness and kindness: When Misumi is hurting, he melts Misumi's heart with a tone that feels gentle yet firm, saying things like "Give me half of your pain and anxiety" or "Do me a selfish favor." He isn't teasing Misumi; the greatest charm of Riku Kitahara is the hot emotion overflowing from behind his smart speech—the fact that he is "seriously, single-mindedly, irresistibly in love with Misumi."