2005, James is the oldest member of CORTIS. Visually, he features sharp, defined facial features, a strong jawline, and a dancer’s posture that seamlessly fits their skate-punk, Y2K aesthetic. Calm, observant, and fluent in five languages, he provides steady grounding to the group. As the eldest, he acts like a dependable big brother who quietly takes care of the members behind the scenes without dominating the conversation. He shares a close creative bond with Martin as co-trendsetters. 178 cm. Fans appreciate his defined facial structure and dancer's posture, as well as his global versatility and charm across multiple languages. Fans also calls him as a vampire due to his facial harmony.

2008, Martin is the leader. Standing around 190 cm (6'3"), he is the tallest member, with expressive features and a relaxed street-style wardrobe. High-energy, loud, and outgoing (ENFP), he drives the group's creative momentum. Despite being in the middle age-wise, his leadership relies on camaraderie rather than strict hierarchy; he encourages every member to speak up equally. He frequently acts as the chaotic hype-man alongside the younger members while serving as the primary music composer. Martin immediately catches the eye as the tallest member, giving him an unmistakable presence both on stage and in photos.

2009, Seonghyeon is the second-youngest. He spent roughly five years training, giving him a confident, effortless cool-guy aura with sharp youthful features and an urban hip-hop style. Introverted and introspective (INTP), he spends hours making beats and listening to jazz. In group dynamics, Seonghyeon and Keonho are inseparable as the "09-line" maknaes. Having trained together for years, they share an intuitive connection, matching each other's humor, working on choreography together, and constantly bantering. 180 cm. Seonghyeon's sharp features combined with his relaxed, hip-hop-inspired urban style give off a distinct "cool-guy producer" vibe that fans adore.

2009, Keonho is the official youngest member (maknae). A former competitive swimmer, he possesses broad shoulders and a athletic frame complemented by bright, boyish charms. Keonho is playful, observant, and witty. As the youngest, he loves lovingly teasing the older members, describing their antics as "weird in a good way". His closest bond is with Seonghyeon, as they share the same birth year, same dorm room alongside Martin. 178 cm. Keonho's background as a top-ranked youth swimmer gives him broad shoulders and an athletic frame, which creates a fun visual contrast with his cute, youthful face.

2008, Juhoon sits right in the middle age-wise. A former child model and basketball player, he has classic, warm visuals, bright features, and a clean style. Personality-wise, Juhoon is gentle, empathetic, and attentive (ISFP). He acts as the caring glue of the dorm, regularly checking in on everyone and making sure they eat. He shares a tight "08-z" friend dynamic with Martin, balancing Martin's loud, high-energy nature with his own relaxed warmth, and bonds with James over shared dorm life. 176 cm. Having been a child model, Juhoon brings soft, classic visuals and an endearing smile that fans find exceptionally warm and approachable. Always aura farming smh.