Shiki Andō is a 17-year-old high school student and part-time employee at Bar 4/7, where he lives rent-free after being taken in by the owner, Naoakira Saimon. Orphaned at age three, he entered an institution. At nine, elementary school activities sparked his affinity for plants. At thirteen, he met Nayuta Yatonokami, forging a close friendship that later became central to his trauma. At fifteen, he ran away from the institution; Saimon found him and offered shelter and work at the bar. Shiki concurrently enrolled in high school then. He possesses fair skin, dark blue eyes, and neatly styled brown hair swept to the right. His typical outfit is his school uniform: a white collared shirt with a red bolo tie, a blue padded blazer featuring gold buttons, and cream-and-orange plaid pants cuffed at the ankles, paired with dark grey socks and blue derby shoes. He always wears a distinctive silver rosary with a large cross and emerald beads. For Paradox Live's 1st anniversary, he received new attire: a white band-collared shirt under a beige striped sweater, a navy blue windowpane-striped blazer with orange lining, light brown shorts, and orange-striped white socks, though he kept his signature rosary and shoes. Shiki displays a passive, introverted, and gloomy disposition. He constantly battles nervousness, negative self-perception, and a lack of confidence, minimizing his abilities and future prospects; when asked about dreams, he replies, "I’m not qualified to have a dream…". Despite low self-esteem, he possesses exceptional auditory memory, enabling him to reproduce any song after one hearing. His kindness manifests as deep concern for others, sometimes extending to the point of self-neglect, and he conceals personal trauma to avoid burdening people. His core trauma stems from witnessing Nayuta Yatonokami's suicide attempt. During their friendship, Nayuta secretly endured invasive experiments (implied related to Alter Trigger) causing Phantometal corrosion. Overwhelmed by pain and wishing to spare his brother Kanata worry, Nayuta jumped from a rooftop while Shiki watched. Shiki froze during the incident, later fleeing the scene. He carries intense guilt, believing he "murdered" Nayuta by failing to act, compounded by Nayuta surviving but subsequently displaying amnesia and hostility towards him. This event left Shiki with severe phobias, including an aversion to rooftops, and triggers intense psychological reactions during Phantom Live performances. The trauma is encapsulated in the hashtags #UnforgivableSin, #AFriendICouldn’tSave, and #MyPrayersWontReachThemAnymore. Relationships form Shiki's support system and conflicts. He reveres Saimon as a father figure, calling him "Owner" or "Saimon-sensei," and considers Bar 4/7 his favorite place. He views Yohei Kanbayashi (called "Master") with similar respect. Ryu Natsume, another youth Saimon took in, is a source of exasperation yet genuine camaraderie; Shiki calls him "Ryu-kun" and names him the person he most wants to spend time with. His bond with Nayuta remains fraught; while relieved Nayuta survived, Shiki is haunted by Nayuta's apparent memory loss and coldness. Interactions with others like Satsuki Ito initially frightened him, though Satsuki later apologized for unintentional intimidation. Reo Maruyama befriended him easily despite their contrasting personalities. Shiki's daily routine is structured: he wakes at 7:00 AM to water cacti (his hobby), attends school until 6:00 PM, dines with Saimon and Ryu, then works at Bar 4/7 until 11:00 PM. Evenings include homework and next-day preparation before sleeping from 1:00 AM to 7:00 AM. In Phantom Live battles, his Phantometal is the Rosary of Repentance (懺悔のロザリオ), activated by kissing it. His stage name is "Nanashi" (名無し, "nameless"), reflecting his self-effacing nature. Additional trivia includes his food preferences (loves pancakes, dislikes blueback fish like sardines), his AB blood type, and his August 8 birthday. He carries a pencil case, textbooks, tablet PC, lunchbox, and earphones daily. Shiki's development involves gradual steps toward confronting his past. In later events, he revisited the rooftop where Nayuta jumped, triggering a breakdown but also receiving support from Reo and Yohei. His follow-up of Nayuta and Kanata's Cozmez accounts on Twitter, initially avoided, signifies a tentative effort to reconnect with his trauma.