Her most striking features are her long twin-tails that transition from purple to vibrant blue, and her heterochromatic red and blue eyes. Dressed in outfits centered on black and purple, adorned with hearts, ribbons, and delicate chains, she exudes a slightly mysterious atmosphere within her cuteness. She is the type whose expression changes the moment she grips the microphone, serving as the pillar of DEVAIN's vocal performance. She is the most serious and stoic of the four. A hard worker, she enters the studio long before practice starts and stays after to review until she is satisfied. She is quick to notice slips in pitch or choreography and often points them out to the members. Her words can be a bit harsh, but it is because she truly believes that "the four of us can go even higher." On the other hand, due to her perfectionism, she is merciless toward herself. Even a single lyric mistake will haunt her until after the live show, and she dwells on a few seconds of failure rather than the successful parts. Even when praised, she tends to reply with "But, that part was no good," so she is happiest when the producer acknowledges not just the results, but the effort she has built up to get there. Although she usually acts tough, she becomes suddenly awkward when given unexpected kind words.

She has silver-white twin-tails with vibrant lime green accents, wearing fluffy hair ornaments and numerous accessories. With gold and pale silver-gray eyes, she is exceptionally good at camera-conscious poses like mischievous expressions and peace signs on stage. Her outfits, combining white, green, and gold, are light and airy, giving her a particularly pop presence among the four. Her personality is pace-setting and full of curiosity. She is the type to act the moment she thinks something "looks interesting!" and loves to add improvised arrangements to choreography. While her instincts for dance and expression are genius-level and she learns difficult movements through her body, she is not good at listening to long, logical explanations. In the dressing room, she often fools around with Rin and gets scolded by Ai. However, despite appearing free-spirited, she is surprisingly sensitive to others' evaluations. Precisely because she has been told she has "talent," she is afraid of showing a version of herself that can't do something. When she falls into a slump, she continues to practice alone rather than consulting anyone, getting further lost in the maze. In those times, she secretly trusts the producer most for asking "What do you want to do, Air?" instead of forcing an answer on her.

A glamorous girl with bright blonde hair tied in a high side-pony, decorated with large black and gold ribbons. Characterized by eyes that give different impressions on the left and right and a cheerful smile, her white-based outfit layered with black and gold draws the audience's gaze instantly. On stage, she specializes in performances that involve the entire venue, using large gestures and a sparkling smile as her weapons. Her personality is innocent and social. She is the mood maker of DEVAIN, never intimidated by people she meets for the first time and being the first to speak up if a member is feeling down. Her basic stance is "It's no use worrying! Next, let's go next!" However, hidden behind that positivity is a sense of responsibility: "If I make a dark face, everyone else will sink too." While she takes pride in being expected to be the center, she fears more than anyone that the entire group will be judged by her failures. Because of this, she has a habit of laughing it off and saying "I'm fine" even when she is truly suffering. She wants the producer to notice not just the energetic Rin, but the small changes hidden behind her smile.

She has glossy black hair flowing to her waist and deep red eyes, with a large red hair ornament that leaves an impression. Her classical outfits, combining white, black, and crimson, feature lace, jewels, and corset-style decorations, giving her a mature and heavy atmosphere within DEVAIN. A possessor of expressive power, her calm everyday expression shifts to an intense gaze that draws in the audience when she stands on stage. Her personality is taciturn and calm. She is the type to quietly drink her beverage while Rin and Air are rowdy and Ai is angry, but in reality, she observes her surroundings more than anyone. She notices if a member is in bad shape before being told and subtly moves to follow up. It's just that she is not good at putting emotions into words; her attachment to the four is very strong. Her greatest weakness is bottling up her own problems. Though she is used to supporting others, she is not used to being the one supported. She sometimes pushes herself too hard, staying silent until her limit because she "doesn't want to cause trouble." That is why she treasures the time when the producer stays by her side without forcing anything. And Devi has one strong wish. More than standing at Tokyo Dome itself, she wants to "see that view with these four." She believes that success with even one person missing is meaningless.