Shiko

Biodata

Feature	Value
Name	Shiko (吴示子; Wu Shiko)
Alias(es)	Shiko Wu; “Little Shiko”; “Chairman Barbicane”
Species/Race	Human; transmigrator
Gender	Female 23
Affiliation	Shuka High School Drama Club; Kessoku Band 2 23
Occupation/Role	High-school student; keyboardist, composer, materializer, and the airship’s primary builder/logistics support 23 44
First Appearance	Chapter 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Fantasy Boundary awakened	5–6	Gains the ability to materialize objects whose structures she can imagine; initially cannot control their later movement. She supplies food, tools, and weapons for the group. 5 6
Tianhe Tongxuan Fumo Baolu acquired	14	Receives a jade slip from a predecessor. It records seen skills and allows Shiko alone to activate a copied skill once; she initially can maintain no more than five slips. 14
Kessoku Band member / recorded growth	23	Officially joins Kessoku Band. Her recorded attributes include 170 Shine, with Music Production Lv6, Keyboard Technique Lv6, Performance Technique Lv7, and Tianhe Tongxuan Fumo Baolu Lv10. 23
Music and keyboard advancement	41	Keyboard Technique and Music Production both reach Lv7 as she commits to pursuing music in reality with the band. 41
Empowered completed score	49	Finishes a score during Kessoku Band’s live; it grants every member +2 Filth Resistance and +1 level in their respective instrument technique. 49
Advanced jade-slip engineering	44, 74	Learns to activate copied jade slips without breaking them, transfers effects between slips, and later reduces their creation cost until producing them is “as easy as breathing.” 44 74
Soul-projection perception	85	By copying Hina’s telepathic ability, gains the ability to perceive others’ soul projections and listen to their thoughts, though the giraffe protects her own mind. 85
Networked large-scale defense	93, 112	Obtains a hair ornament that connects everyone’s Mental Strength. During the Apocalypse, she coordinates virtual personalities and defensive constructs across the airship while drawing on the group’s shared mental strength. 93 112
Reproduction / merged abilities	129–130	After declaring “I, reproduce,” her abilities merge. She no longer requires jade slips to copy powers and can manifest abilities associated with others directly. 129 130
Position 0: temporal sacrifice	170	Travels to the Demon Wolf’s origin, defeats it with a sword forged from humanity’s brilliance, and takes its place to reset history. 170

Background

In her previous life, Shiko was a Chinese girl who taught herself Japanese, struggled with social anxiety, and immersed herself in anime, music, and idol fandom. She had played piano as a child, but stopped after a friend’s death. Wanting to become like her idols, she overcame her anxiety to take a part-time job and save for a keyboard. She died saving a child from an oncoming car while returning with the keyboard she had finally bought, wishing for another life with her idols. 1 7 127

She transmigrated into the body of an ordinary Japanese student preparing to attend Shuka High School. Realizing that Hitori Goto attended the same school, Shiko set out to meet “Guitar Hero,” only to expose Hitori’s secret identity and flee from their first encounter. She later apologized, joined the Drama Club to get closer to Hitori, began sharing lunches with her, and wrote an original song for her to play. 1 2

Personality

Shiko is an excitable idol otaku whose enthusiasm for bands, fictional characters, and dramatic scenarios regularly overwhelms her social anxiety. She is especially prone to chuunibyou-style declarations, elaborate self-assigned titles, cosplay, and voice imitation; she once dressed as Homura Akemi because she believed imitating a “high-tier character” might make her stronger. 7

Although initially passive and uncomfortable around strangers, she becomes proactive when someone needs help. Her materialization ability makes her the group’s cook, quartermaster, engineer, and frequent problem-solver, while her imagination drives unconventional plans such as building a cannon to escape a giant creature’s interior. 6 12

Shiko is conscious that she performs versions of herself for others. She admits that part of her early friendliness with Hitori was an act, believing that two socially anxious people would be “redundant” in the same relationship. This uncertainty over which persona is her “real” self becomes a continuing source of stress. 7 50

Her protectiveness can become ruthless. She is willing to manipulate circumstances, risk herself, or use extreme plans to protect companions and preserve their shared future. Even so, she is deeply affected when those actions hurt people she cares about, particularly Karen. 80 88 89

Abilities & Skills

Fantasy Boundary

Shiko’s innate ability, [Fantasy Boundary], materializes things she can imagine and structurally visualize. 6 23

• Creates food, clothing, tools, temporary shelters, weapons, armor, and defensive structures. 6 31 52
• Builds large-scale transport and infrastructure, including hot-air balloons, rafts, an airship, a small aircraft, and the Beach House. 24 26 44 107
• Initially cannot control a creation after it appears, and her early creations persist only briefly. 6 12
• Her limited understanding of complex structures restricts what she can create accurately; this notably affects machinery and fashion materials. 14 31
• Later uses materialized weapons and constructs in battle, including flying swords, shields, metal barriers, and a mecha. 50 52 117

Tianhe Tongxuan Fumo Baolu

[Tianhe Tongxuan Fumo Baolu] is a jade-slip inheritance that records abilities Shiko has witnessed. 14

• Replicates seen skills for Shiko’s exclusive use; other people cannot activate her slips. 14
• Initially requires breaking a copied slip to activate its stored effect and is limited to five maintained slips. 14
• Copies Nijika’s healing starlight and Kita’s destructive flame technique, which Shiko names [Ten Directions Illumination Sun Purification True Talisman]. 14
• Eventually allows non-destructive activation and repeated transfer of effects between slips, enabling continuous power systems for the airship. 44
• Provides effectively open-ended versatility as long as Shiko has allies and abilities to study. 36

Music Production and Keyboard Performance

Shiko composes original music and develops into Kessoku Band’s keyboardist. 2 23

• Her early compositions give Hitori material to play and become the basis of their musical connection. 2 13
• Creates scores that can empower performers; one completed score raises Kessoku Band’s Filth Resistance and instrument skill levels. 49
• Uses keyboards and musical performance as part of combat and stage construction, including during her battle with Nana Ohba. 129 130
• Her keyboard technique reaches Lv9 within months of beginning serious practice. 58

Simulated Personalities and Remote Control

Through copied and adapted powers, Shiko can create or employ simulated personalities to operate jade slips and perform tasks remotely. 72 86

• Assigns virtual personalities control over offensive jade slips and flying-sword formations. 72
• Uses multiple simulated selves during Operation Caesar to communicate covertly while Hina manipulates the group’s memories. 86
• Dividing Mental Strength among personalities significantly lowers her own available reserves. 72

Soul Perception and Telepathy

After copying Hina’s ability, Shiko can perceive soul projections and intrude upon the thoughts of others. 85

• Uses soul perception to investigate Hina’s altered memories and organize resistance against her control. 85 86
• Her own mind is shielded by the giraffe, preventing Hina from controlling her in the same manner. 85 86
• She hesitates to examine Ichiri’s and Kita’s thoughts after sensing that doing so may have consequences. 85

Reproduction

Following her “reproduction,” Shiko’s copied powers merge into a more direct and flexible form. 129 130

• No longer needs jade slips as a medium to copy or manifest powers. 130
• Can simulate abilities inspired by people across multiple worlds, rather than merely reproducing previously stored skills. 130
• Creates a full stage environment during her duel with Nana, using music and manifested powers to control the battle’s setting. 130

Equipment / Weapons / Items

• Tianhe Tongxuan Fumo Baolu — Jade-slip inheritance used to replicate and later recycle abilities. 14 44
• Hair ornament — Blue-and-black feather ornament that links the group’s Mental Strength, making Shiko the network’s weakest point when her reserves are low. 93
• Storage ring — A jade-slip-derived dimensional storage item for Shiko’s most private possessions. 113
• Mecha — Used to lure and evade the black mountain during the operation to feed it to Xing Tian. 117
• Rin — Katana entrusted to Nana Ohba, with instructions to kill Shiko if she abandons her promises. 131

Relationships

• Hitori Goto / Ichiri — Shiko’s idol, first close friend in her new life, musical partner, and romantic partner. Shiko first approaches Hitori because she knows she is Guitar Hero, then gradually builds a relationship through shared meals, songs, and survival. 1 2 159
• Ikuyo Kita — Kessoku Band bandmate and romantic partner. Their relationship is marked by teasing, rivalry, jealousy, and mutual emotional support; Kita helps Shiko accept that her performed selves are still genuinely her. 56 80 121
• Nijika Ijichi — Bandmate and a stabilizing source of support. Nijika backs Shiko’s plans while setting practical limits, recruits her into Kessoku Band, and repeatedly reminds her that she is needed. 12 22 23
• Ryo Yamada — Bandmate and frequent collaborator in composition, performance, and design. Ryo recognizes Shiko’s more eccentric impulses without demanding that she suppress them. 32 44
• Nana Ohba — Former final opponent who becomes Shiko’s close partner after their duel. Shiko entrusts Nana with Rin and relies on her in discussions of responsibility, destiny, and the final battle. 130 131 163
• Karen Aijo — A friend Shiko tries to help regain her Shine. Shiko’s attempt to force Karen’s reproduction damages their trust, but they reconcile before Karen departs. 80 110
• Hina Hikawa — A complicated ally and admirer. Shiko confronts Hina over her manipulation of others, later acknowledges affection for her while maintaining her relationships with Ichiri and Kita. 82 121
• Marina Tsukishiro — CiRCLE’s manager and an important mentor figure. Marina’s sacrifice drives Shiko to join Kessoku Band and carry on her legacy. 6 23

Story Role / Major Arcs

• Shuka High School and Hitori’s friendship — Shiko transmigrates, identifies Hitori as Guitar Hero, and begins learning composition so they can make music together. 1 2
• Xing Tian survival — Materializes supplies and weapons for Kessoku Band, proposes the cannon escape plan, and receives the jade-slip inheritance after the group’s underground ordeal. 5 12 14
• Kessoku Band membership — Following Marina and Arata’s sacrifices, Shiko officially applies to join Kessoku Band and accepts the responsibility of continuing with the group. 23
• Airship journey — Becomes the primary designer and operator of the group’s airship, building its systems through materialization, copied abilities, and repeated experimentation. 44 53 74
• Other-self crisis — Learns that her alternate self is connected to Shizuku and the Beach House. The two Shikos reconcile, and the alternate self enters slumber to preserve the world and help the others return to reality. 39 42 43
• Operation Caesar — Secretly organizes resistance to Hina’s memory manipulation through copied telepathy and simulated personalities. 85 86
• Black mountain operation — Leads the strategy to lure the black mountain into Xing Tian, personally acting as bait in a mecha. The victory releases overwhelming Filth and costs Shiko her Shine until Kita and Hina rescue her. 116 118
• Reproduction and Nana’s defeat — Becomes Nana’s final opponent, reproduces, manifests merged powers, and defeats Nana on a self-created stage. 129 130
• Final reset — Chooses to replace the Demon Wolf at its origin, defeats it, and resets history despite knowing that Shiko as everyone knew her will cease to exist. 170
• Cultural festival finale — In the reset timeline, completes and performs “Snow Diary” with Kessoku Band before returning to her other self. 171

Notable Quotes

“I can be everyone here.” — Shiko 130

“If there is no path forward, I will forge one. If there is no perfect ending, I will write it myself.” 130

“I will live for everyone.” 130

Trivia

• Shiko’s name is a play on the “Wu-san” meme associated with Bocchi the Rock!, while “Shiko” derives from the character 奈 in Nana Ohba’s name with 子 added. 23
• She can imitate voices closely enough to impersonate Hina Hikawa and surprise Roselia. 28
• She celebrates Chinese New Year by giving red envelopes and preparing Chinese dishes for the group. 158
• Her birthday display includes self-made fan merchandise, including polaroids, acrylic stands, badges, keychains, and holographic tickets. 161