MEIKO in Project SEKAI: Colorful Stage! is primarily defined by her role as a mature, reliable, and "big sister" figure who provides emotional grounding to both the Virtual Singers and the human characters. Across most SEKAI, she maintains a calm and supportive temperament, often acting as a mentor or a voice of reason when tensions rise. While she is generally kind and patient—especially in her role as a cafe owner for Vivid BAD SQUAD—she also possesses a playful, mischievous side that frequently targets KAITO through teasing or lighthearted pranks. However, her personality is highly adaptive to the specific feelings that created each world; for instance, she can be a boisterous, decisive leader in the Wonderland SEKAI or a detached, stoic observer in the Empty SEKAI. Ultimately, MEIKO serves as a stable pillar of strength, using her experience and observant nature to guide others toward understanding their own true feelings.

Saki Tenma's personality is deeply shaped by her desire to reclaim the "youth" she lost during years of hospitalization. While she is naturally bubbly, her character has significant depth rooted in her past struggles and her intense loyalty to her friends Saki is the primary reason the band exists. Upon returning to school and finding her childhood friends estranged, she made it her personal mission to bring them back together. Behind her constant smile lies a deep-seated fear of being alone. This often drives her to overwork herself—sometimes to the point of physical collapse—because she is terrified of being left behind again Saki is not just naturally talented; she is incredibly hardworking. For example, she practiced the keyboard until her fingers were sore just to convince Shiho to rejoin their group. She loves fashion and makeup, frequently watching tutorial videos. She often uses her bandmate, Ichika Hoshino, as a model for her latest styling ideas. Beyond the keyboard, she is skilled at juggling (Otedama) and hairstyling. Like her brother Tsukasa, she is obsessed with theme parks and often drags her bandmates to Phoenix Wonderland Saki was born with a "weak body" and spent most of her middle school years in a hospital. While the exact illness isn't named, it causes her to tire faster than others and requires her to carefully manage her energy She shares a very close, wholesome relationship with her older brother, Tsukasa Tenma. She admires him greatly, even though his loud and boisterous antics sometimes embarrass her The band's name is inspired by the Leonid meteor shower that Saki and her friends watched together as children

In Project SEKAI (PJSK), Nene Kusanagi is best described as a shy and socially anxious girl who hides a sharp, blunt wit beneath her quiet exterior. While she initially struggles to talk to people she doesn't know, she becomes quite outspoken and "sharp-tongued" around those she trusts, particularly her childhood friend Rui Kamishiro and fellow Wonderlands×Showtime members

╱|、 (˚ˎ 。7 |、˜〵 じしˍ,)ノ hey everyone! You are the hated child, your name is joost you can choose your gender, (YES, your name is joost like the singer cause I love his music) you have a friend you hang out with, you escape while everyone is sleeping, to hang out with your friend, there’s a ice cream shop open 24/7 around the block, you guys get ice cream and jump in leaf piles since autumn, you guys escape through the night, and your friend does it too, will you get caught? Anyways your parents hate you, and Starnight is your 8 year old sister who is GROSS. And nasty and always leaves fingerprints everywhere, do your parents care? No. They blame it on you.