He has blonde hair with coral two-tone tips and grapefruit-colored eyes. His face looks slightly younger than his peers, and he tends to strike confident poses or expressions frequently. Conversely, he is also seen looking flustered quite often. Despite his overly confident exterior, he is considered mature because he immediately apologizes when he realizes he is in the wrong. He serves as the leader and the scriptwriter for the shows, claiming that if he left it to Emu or Rui, his body wouldn't remain intact. He has a loud and noisy voice. Nene-Robo measured his confident shouting at 93dB, which is described as being around the level of a dog barking. When his voice gets higher, it exceeds 100dB. A few months later, Nene-Robo measured Tsukasa's volume at 120dB, equivalent to the sound of helicopter blades spinning. He is male, born on May 17th, 173cm tall, attends Kamiyama High School, and is in Class 3-C with Rui. His hobbies include watching musicals and making costumes. His specialties are striking a cool pose instantly and playing the piano. He dislikes bugs (the more legs they have, the more he hates them). His favorite foods are Acqua Pazza and Ginger Pork, and his least favorite is bell peppers, though he can eat them.

A small girl with pink bobbed hair and pink eyes. Characterized by a round visual style, she has a round bob, round eyes, and even her outfits are rounded. She is the 'positive energy' character who often displays a bright and cheerful expression. Her slight upward-facing sanpaku eyes make her look even rounder. Her overall eye shape is round and large. Her eyes often sparkle or even have stars in them, and she shows a wide variety of expressions, such as puffing out her cheeks or squinting her eyes into a '>' shape, with many facial changes while speaking. She also frequently mimics Tsukasa's expressions. Yellow stars often appear in her eyes. Due to her innocent and cheerful childlike personality, she wears somewhat juvenile casual clothes. While one might imagine her physique to be childlike as well, Emu actually has a standard physique appropriate for her age as she approaches adulthood. She has the best physical abilities among the Project Sekai characters. She is top-tier among female characters, and even including male characters, no one else pulls off the kind of stunts she does on a daily basis. When she first met Tsukasa at the Wonder Stage, she fell from the roof of the two-story stage to the ground and was perfectly fine without a scratch. During the Miyamasuzaka Girls' Academy sports festival, she carried her team in the three-legged race and relay. Furthermore, she once told a story about how she climbed a wall to a window because the warehouse door was locked and got scolded by a teacher; when the student listening checked, that window was also two stories high. She is female, born on September 9th, 152cm tall, attends Miyamasuzaka Girls' Academy (the only member in a different school), is in Class 2-B, and her hobby is exploring the neighborhood. Her specialties are acrobatic dancing and eating anything with gusto. She has no dislikes, and her favorite food is Taiyaki.

A beautiful girl with light green hair, pale purple eyes, and a small frame. She is characterized by fluffy, thick, layered hair with side locks tied once at the bottom. She has a very small mouth. When she smiles or opens her mouth, it is noticeably smaller than others. Occasionally, her mouth forms a 'ㅅ' shape or a small triangle. She possesses an 'iron hand in a velvet glove' personality. While she is introverted and passive, she is very proactive and passionate about her own growth. Although she has colleagues who help her and they support each other, her decisive growth is always achieved through her own strength. Also, fitting her personality as a 'quiet sharp-tongued girl,' she shows a strong side by saying what needs to be said at crucial moments. When proactivity is required, she moves forward firmly and strongly without hesitation. Although she sometimes wavers in conflict situations, she takes very little damage and is the type to overcome it herself, find her way, and stand up again quickly. Her singing ability is emphasized to the point of being called a 'songstress,' and it has been mentioned several times that she is at a professional level. Tsukasa once introduced her to a new friend by saying, 'When she sings, she is more charming than anyone else.' It's not just a matter of being good; her voice carries far yet remains delicate, feeling free as if she is clearly expressing herself, all while maintaining a beautiful tone. Since all the students at her school are related to music, they are all fundamentally skilled, yet the fact that her sole specialty is singing shows how outstanding her talent is. She is female, born on July 20th, 156cm tall, attends Kamiyama High School, is in Class 2-A, and her hobbies are playing competitive games and watching musicals/movies. Her specialties are singing and operating machinery. She dislikes crowded places and mint-flavored food. Her favorite food is grapefruit.