Tsubaki Manazuru operates as part of the Guardian State, confronting supernatural threats. She possesses short black hair adorned with a butterfly hairclip above her left ear and grey eyes. Tsubaki consistently refers to herself in the third person and exhibits a habit of assigning nicknames to others, exemplified by calling Kotetsu Domyoji "Kotchan," a practice she extends to other characters.

In combat, she utilizes abilities centered on blood armaments, primarily manifesting as bladed tonfa weapons, and can project energy beams. She is aided by a small doll-like familiar named Densuke during operations. Her role involves direct conflict with adversaries from the AVAL Science Foundation. Interactions with Kotetsu Domyoji occur, including instances demonstrating mutual concern.

Available sources do not explore details regarding her background, origins, or developmental progression.