Nikki Hanada

Nikki is strict, dependable, physically intimidating, and often takes responsibility for keeping more impulsive fighters under control. Her appearance and strength lead others to treat her as a tough older-brother figure, although she privately has a much softer and more traditionally romantic side than that image suggests.

Before petrification, Nikki struggled through exhausting judo training after being pushed into the sport because of her build. Lillian Weinberg's music became an emotional refuge during that period. Her fandom is unusually serious: she listens closely enough to recognize details in Lillian's speech and singing that an ordinary listener would miss.

That emotional attachment does not make Nikki gullible. When confronted with a supposed live communication from Lillian, she aggressively tests the claim rather than accepting what she wants to believe.

Nikki is one of the physically strongest ordinary members of the Kingdom of Science. Her size, muscular build, and judo background give her significant grappling strength and the ability to restrain people such as Magma and Yo Uei.

Her pre-petrification judo experience gives her practical knowledge of throws, holds, balance, and controlling opponents without relying on weapons. She is useful both as a combatant and as an informal disciplinarian when stronger personalities within the group begin fighting among themselves.

Nikki also develops conversational English and possesses exceptionally detailed knowledge of Lillian's voice. Her ability to distinguish authentic recordings from imitation becomes strategically important during the Stone Wars.

Tsukasa revives Nikki because her physical strength fits the type of young, capable people he wants in his new society. She is eventually assigned to supervise Taiju Oki and Yuzuriha Ogawa, whose covert work inside the empire makes such supervision dangerous for the Kingdom of Science.

Gen Asagiri later attempts to persuade Tsukasa's followers that America has already been restored by imitating Lillian's voice over the Kingdom of Science's telephone. Nikki immediately recognizes inconsistencies and challenges him.

The deception only survives because Senku possesses Lillian's genuine final recording. Hearing the authentic voice and learning that the Kingdom of Science intends to preserve the music rather than exploit it convinces Nikki that their cause deserves her support.

She becomes one of the most reliable former members of the Tsukasa Empire after the conflict, joining the Kingdom of Science's Power Team and helping maintain order during later expeditions.

During the campaign in America, Nikki's physical strength places her among the fighters who directly oppose Xeno's forces, including Maya Biggs.

Lillian Weinberg is Nikki's musical idol. Lillian's songs gave her emotional support before petrification and remain one of Nikki's most treasured connections to the lost modern world.

Gen Asagiri initially tries to deceive Nikki by impersonating Lillian, but Nikki's knowledge of the singer forces him to rely on the genuine recording.

Senku Ishigami earns Nikki's loyalty by proving that he possesses and intends to preserve Lillian's surviving song.

Taiju Oki and Yuzuriha Ogawa are placed under Nikki's watch while she belongs to the Tsukasa Empire.

Magma and Yo Uei are among the troublesome Kingdom of Science members Nikki frequently keeps in line.

Tsukasa Shishio is the person who revives Nikki and originally brings her into the Stone World's political conflict.