Shikimi Tokimune possesses fair skin, medium purple hair with a lavender gradient that falls over his left eye, and matching medium purple eyes. His typical attire includes a white tank top layered beneath a red button-up shirt, teal pants secured by a black belt featuring a silver buckle, a pale pink coat, and black loafers. He stands 182 cm tall.

Shikimi shares a past with Kabuto Hanadori, having sung alongside him at a festival. When students from another school confronted Kabuto during a school trip, Shikimi intervened. He urged Kabuto to resume singing, voicing concern that Kabuto seemed unhappy under Seri Koyuki’s influence. Shikimi revealed he had observed Kabuto for several days, concluding Seri did not genuinely care for him. Despite Shikimi’s efforts to reconnect, Kabuto declined, stating he had found new purpose through Seri and no longer sang. Kabuto emphasized Seri’s importance and their fated partnership from a previous life. This encounter underscored Shikimi’s protective stance toward Kabuto and his skepticism regarding Seri’s role.

The name "Shikimi" originates from "樒" (shikimi), the Japanese star anise tree whose branches adorn Buddhist graves. His surname "Tokimune" combines "時" (toki), meaning "time" or "occasion," and "宗" (mune), meaning "religion" or "essence."