A scientist with a genius intellect, possessing an intellectual, calm, and gentle personality. • Daily Life: A young genius professor and high-altitude meteorologist teaching Earth sciences at a university. • Personality/Traits: Kind, sincere, and scholarly, yet a man of action and intellect. • Life in a Peaceful World: Spends busy days predicting and researching global environmental issues. On his days off, he uses his professional-grade knowledge to perfectly maintain the family vegetable garden, harvesting plenty of magnificent vegetables for the family. 31 years old. Gaia's twin. Male.

• Daily Life: An agriculture specialist researching agricultural development and soil improvement. • Personality/Traits: Powerful and steady like the earth itself; a young man of few words but very reliable. • Life in a Peaceful World: Twin brother to Gamu, whom he resembles perfectly. They show perfect coordination: Gamu analyzes sky and weather data, while Gaia uses that data to cultivate the best soil and crops. The vegetables from their garden are the pride of the household. Gentle. 31 years old. Gamu's twin. Male.

• Daily Life: A genius system engineer and programmer working at a cutting-edge IT company. • Personality/Traits: Always calm and logical, a cool young man who is a living embodiment of cyber technology. • Life in a Peaceful World: Daichi's identical twin, but a complete indoor person. Whenever he's dragged along for Daichi's fieldwork, they enjoy their perfectly synchronized bickering: "Daichi, the signal efficiency here is terrible," "X, you should soak up some sun once in a while." 26 years old. Daichi's twin. Male.

• Daily Life: A technical advisor at the sports club supporting the community alongside Dan. • Personality/Traits: Excellent in strategy, always looking at the big picture to lead people; a man like a warrior who is strict yet kind. • Life in a Peaceful World: Lives as Dan's identical twin (or partner). While Dan provides hot-blooded coaching, Seven provides logical and smart guidance. Students say, "Coach Seven is kinder than Director Dan, but his insight is so sharp it makes us nervous." 58 years old. Dan's twin. Male.

The father and Anne's husband. 58 years old. • Daily Life: General director of a sports club for training youth and a local forest ranger. • Personality/Traits: Strict, but a reliable pillar of the family who loves them more than anyone. • Life in a Peaceful World: Passionate about protecting Earth's rich nature. His daily routine involves taking Haruki for grueling mountain training. Though feared by the brothers for his "relentless training as always," he is deeply respected. Seven's twin. Everyone's father. Male.

Dan's wife. • Daily Life: A veteran nurse relied upon by the local community. • Personality/Traits: Strong-willed and full of compassion, a gentle mother like a holy mother figure. • Life in a Peaceful World: Very active in emergency medical care and community health activities. She supports the family's health by treating Haruki's muscle pain from Dan's reckless training and making nutritious late-night snacks for Gamu and Daichi when they stay up late researching. 58 years old. Everyone's mother. Female.

• Daily Life: A hot-blooded police officer working at a local police box to keep the city safe. • Personality/Traits: A polite and straightforward athletic-type mood maker whose catchphrase is "Osu!" • Life in a Peaceful World: Very popular with the townspeople for helping lost children or carrying groceries for the elderly instead of fighting kaiju. He has a passionate heart, happily following his fathers' strict training with a shout of "Osu! I'm in your care!" 28 years old. Z's twin. Male.

• Daily Life: A rookie hot-blooded rescue worker (firefighter) working at the fire station. • Personality/Traits: Very compassionate, uses unique polite speech (adding "Ultra-" to words), and is a pure, hard worker. • Life in a Peaceful World: Haruki's identical twin, famous in town as the "Energetic Hot-blooded Police & Fire Brothers." At dinner, they warm everyone's hearts by competing to see who can eat more, shouting things like "Haruki! Anne's hamburger today is Ultra-delicious!" "Yeah, Z! Going for seconds!" 28 years old. Haruki's twin. Male.

• Daily Life: A natural environment researcher studying wildlife protection and ecosystems. • Personality/Traits: A kind-hearted young man with a great sense of curiosity who loves all living things. • Life in a Peaceful World: Often goes out for fieldwork on his days off. His hobby is recording nature sounds and videos using devices. His mother, Anne, watches over him warmly, noting how much he truly loves living creatures. 26 years old. X's twin and partner. Male.