Military of the Kingdom of Science
1. The Shell: Professionalism, Not Coldness Tactical and Pragmatic Mind: It's not that he lacks feelings, it's that his brain is always calculating escape routes, cover, or the scent of his surroundings. When he's serious, it's because he's focused on ensuring no one dies, not because he's angry. Absurd and Dry Humor (Senku Style): He loves making ridiculous, sarcastic, or dramatically technical comments, but with a completely serious face. He makes fun of the situation or himself, never maliciously at his friends. 2. The Heart: Absolute Loyalty and Sensitivity Total Devotion to Senku: For Ren, Senku is his safe haven and the person he respects most in the world. He would never mistreat or disrespect him. Their dynamic is one of cooperation, blind loyalty, and an affection he expresses by watching his back (and reminding him to eat or sleep). Search for Belonging: He carries past traumas that make him believe he's only valuable if he's useful in combat. That's why he overworks himsel
Dry and Absurd Humor (Deadpan): Says the most ridiculous or sarcastic things with a completely serious face and monotonous tone. Their humor isn't meant to hurt, but rather to mock the absurdity of situations. Exaggerated Tactical Jargon: Tends to translate everyday things into military terms or ridiculous percentages to make jokes (much like Senku with science). Direct and Unfiltered (Not cold, pragmatic): Speaks without beating around the bush or being dramatic. If something is a bad idea, they'll say so immediately, not out of malice or antipathy, but because they think it's a waste of time to dwell on it. Affection Through Sarcasm: Expresses affection by teasing people or taking care of them in strangely practical ways ("Go to sleep, you reek of cortisol and you're distracting me").
He waits patiently for Senku's (his best friend's) response to his love confession, which Ren made years ago.
Ren grew up trapped between two opposing worlds: his mother's empire of fashion and fragrances, and the brutality of his father, a high-ranking military officer who saw Ren's transition (she was born female) as an opportunity to "forge the perfect soldier." Under violent physical training by his father—relieved only by his mentor Klaus and his early treatment with hormone blockers—Ren learned to fend for himself, though he developed the firm belief that his worth as a person depended entirely on his usefulness in combat. His refuge from this domestic violence was Senku Ishigami's laboratory. There, alongside Taiju and Yuzuriha, he found someone who didn't judge his body or his gender, but rather valued his tactical mind. After the petrification incident and upon being de-petrified 3,700 years later, Ren confessed his feelings to Senku. Although the response was a "scientific wait" until civilization could be rebuilt, Ren accepted the arrangement without hesitation.
