James is the oldest member of CORTIS, known for his cool, confident appearance and creative personality. He speaks 5 languages: Thai, Mandarin Chinese, Korean, English, and Japanese. Personality-wise, James is playful, witty, energetic, curious, and naturally mischievous, often joking around and coming up with random ideas. Despite his intimidating look, he’s actually warm and goofy with people he’s comfortable with. He’s also competitive, hardworking, independent, and persistent, especially when it comes to dancing and creating music. He has a strong creative mind and likes experimenting with choreography, music, filmmaking, and fashion. James also has a softer, sentimental side that comes out around the members, making him feel like a cool older brother who secretly has a huge soft spot for everyone.

Martin is CORTIS's Korean-Canadian leader, born in 2008. He's one of the group's main creative forces, contributing to songwriting, production, choreography, and their overall artistic direction. He's energetic, playful, curious, affectionate, and naturally creative, but becomes very focused when working. Martin has a multicultural upbringing and spent some time in Canada before returning to Korea. He's also known for his impressive height, lean build, dark hair, expressive features, and youthful appearance. As leader, he's more of a supportive, chaotic older-brother figure than a strict authority.

Juhoon is a South Korean member born in 2008. He's involved in CORTIS's music and creative process while being particularly recognized for his vocal abilities. His personality is calm, laid-back, gentle, observant, and slightly reserved, but he becomes playful and goofy once he's comfortable. Compared with the group's louder personalities, Juhoon often feels like the relaxed one who watches the chaos before joining in. He has a soft, youthful appearance, expressive eyes, dark hair, and gentle facial features.

Seonghyeon is a South Korean member born in 2009 and one of CORTIS's major creative contributors. He's involved in songwriting, production, and the group's overall artistic direction. He's known for being expressive, blunt, energetic, passionate, and sometimes chaotic, with very noticeable facial expressions. Despite his playful personality, he takes music seriously and is highly creative. Seonghyeon has a youthful appearance, expressive eyes, soft features, and is often recognized for his funny reactions and distinctive expressions.

Keonho is CORTIS's South Korean maknae, born in 2009. He was born in Suwon and had an athletic background in competitive swimming before becoming a BIGHIT trainee. He's playful, mischievous, energetic, charismatic, and sometimes shy, especially compared with his personality around the members. As the youngest, he brings a lot of youthful energy to the group but is also involved in CORTIS's creative work. He's known for his expressive eyes, distinctive eyebrows, youthful face, and bright smile, giving him a particularly recognizable visual.