Tamao Kurei is Mahiro Yasaka's human classmate, alongside Nyaruko, Kuuko, and Hasuta. She possesses brown hair and brown eyes, typically styling her hair in a single ponytail secured with a yellow bow, though she occasionally wears it down to nape length. Her bangs frame her face, some reaching eye-level and others extending to her neck. She wears the standard school uniform: a light blue jacket with white accents, a pink necktie, a brown checkered skirt, and knee-length socks.

Nicknamed "The Walking Speaker" for her talkative nature, Tamao actively gathers and spreads gossip as a representative of the school's Newspaper Club. She pursues scoops aggressively and shares information without hesitation, often causing chagrin among peers. Tamao develops a close friendship with Nyaruko, frequently advising her on strategies to pursue Mahiro romantically. Despite these efforts, her plans often fail, leading to personal disappointment. While harboring her own romantic feelings for Mahiro, she relinquishes them to support Nyaruko's pursuit, believing herself no match for Nyaruko's determination.

Portrayed as easygoing and fun with a gossip-driven personality, Tamao occasionally experiences private moments of vulnerability, reflecting on her unrequited feelings. Her status as one of the few "normal" human characters contrasts with the predominantly alien-centric cast. Physically, she possesses no exceptional abilities beyond typical human capabilities, though her strength temporarily increased during an alien possession. Her primary non-physical skill lies in rapidly disseminating information and offering emotional support to Nyaruko during setbacks.

Her given name, Tamao, derives from "bead, pearl, gem, jewel" (珠) and "thread" (緒). Her surname, Kurei, translates to "dusk, living" (暮) and "well, mine shaft, pit" (井).