Shiki Amabe is a 22-year-old male with light green hair styled with long bangs often tucked behind his ears and a loose strand falling between his green eyes. He frequently wears square black-rimmed glasses. Standing 181 cm (5'11") tall and weighing 61 kg, his birthday is November 2nd and his blood type is A.

He pursues dual careers as a respected potter and an idol. His pottery attracts regular patronage from the school president, a connection that also facilitated his scouting into the Étoile Vio School's idol program. Shiki performs as a member of the unit ArS.

Personality-wise, Shiki exhibits a flirtatious and smooth-talking demeanor, frequently making advances toward women that the series' producer consistently rejects. Despite this outward behavior, he demonstrates genuine thoughtfulness toward friends and maintains strong platonic bonds with male peers. His adept social skills allow him to read group dynamics effectively, often using humor to diffuse tension or manage the atmosphere within ArS, making him a stabilizing presence.

His primary hobby is pottery, aligning with his profession. Diet-wise, he favors sea grapes and dislikes bitter melon. Known aliases include "Shiki-kun," "Shiki-san," "Shikitty," and "Laplace's Demon," the latter referencing his perceptive nature. He interacts warmly with unitmates, acknowledging frequent glass bead gifts from fellow ArS member Akio Tobikura while noting their impractical accumulation.