Rei Wakana, the vocalist and bassist for RAISE A SUILEN known professionally as LAYER, is a third-year in the Musical Department at Geijutsu Academy. Possessing fair skin and smooth dark-brown hair reaching her upper back, her bangs cover her ears and frame distinctive lightning blue eyes. At 172 cm, she is the tallest main character across the franchise, leading to frequent mistaken assumptions about her age. Her fine arts school does not require uniforms, making her the only main character never depicted wearing one. Maintaining a calm, mature exterior, Rei often creates distance by withholding opinions or hiding personal struggles, such as overworking to perfect bass parts. This reserve stems from her prior experience as a temporary vocalist and support bassist for established artists. Her highly regarded singing ability allows her to perform any song, yet she harbored a childhood complex about her deep voice, feeling it didn't sound age-appropriate. She overcame this shyness through encouragement from her childhood friend, Tae Hanazono of Poppin'Party, whom she met at music school. Rei enjoys taking baths, cooking, and favors hot milk with honey, while disliking bitter coffee and sea cucumbers. Her accessories typically include a studded belt with silver chains, a leather bracelet, and multiple necklaces, often paired with high ankle boots. Her character development centers on learning emotional openness. Initially exhibiting traits of an "Extreme Doormat," she deferred decisions to bandleader CHU2 and avoided asserting her opinions. During the "NO LIMIT!!!" event, she confronted CHU2 about aggressive rhetoric towards rival bands, causing temporary friction but ultimately fostering healthier band communication. Rei also navigated a personal conflict involving Tae, whom she had hoped to recruit for RAISE A SUILEN. Recognizing Tae's commitment to Poppin'Party, Rei prioritized Tae's happiness over her own desire, solidifying her emotional growth. The stage name "LAYER" derives from the Japanese rendering of her given name "Rei" as "Reiya" (レイヤ). Her real name, Wakana Rei, reflects musical harmony: "Wa" (和) meaning peace or harmony, and "Kana" (奏) meaning to play music.