Kazumi Tokiwa, a 12-year-old student at Holmes Detective Academy, forms one half of the detective duo Feathers alongside her partner Alice Myojingawa. Her surname, Tokiwa, merges the characters for "always" and "board," though its narrative relevance remains undefined. A distinctive four-leaf clover hairpin adorns her design.

Kazumi wields a supernatural ability called "Toys," conjuring a bow and arrows of light. This power interlocks seamlessly with Alice’s barrier-based Toys, forging a combat synergy that amplifies their vigilante efforts, inspired by the Milky Holmes team’s heroism. Their partnership, rooted in a childhood friendship, thrives on balanced collaboration—Kazumi’s bold initiative contrasts Alice’s tactical precision.

In *Futari wa Milky Holmes*, the duo ascends to protagonism under the mentorship of the original Milky Holmes members. Official art captures candid moments of their bond, such as sharing ice cream or clasping hands against a beach sunset, though these visuals lack explicit narrative elaboration.

Within *Tantei Kageki Milky Holmes TD*, Kazumi and Alice appear as secondary figures in a storyline unraveling stolen songs and idol-centric mysteries. Their roles expand slightly compared to prior portrayals, though narrative focus remains on the central plot.

Across media, Kazumi’s identity orbits her partnership with Alice and her status as a next-generation detective shaped by Milky Holmes’ legacy. No additional explorations of her personal history or solo arcs are documented, preserving her portrayal as a steadfast half of the Feathers duo.