Rū Hitoma, alternatively romanized as Rue Hitoma, originates from the smartphone game "Heiki Musume Wars" (Weapon Girl Wars). Her visual design integrates elements of the JSDF Type 10 tank, featuring a prominent tank cannon mounted on her chest, large goggles, and headphone-like antennas. She wears cut-out pants that fully expose her underpants.

She develops intense devotion to Haruto Bouida following his substantial financial investment in her via in-game microtransactions. This devotion leads her to affectionately call him "Commander Haru" and believe she is his favored character. Her possessiveness drives attempts to eliminate rivals to secure Haruto's exclusive affection. After defeat, particularly against Nona using a "Shadow Nona" form, she experiences profound shame and distress, consistently seeking consolation through head pats – a source game mechanic that reliably elicits happiness when received.

Following her initial defeat and abduction attempt against Nona, she integrates into the group of moving figures, continuing to compete for Haruto's attention alongside them. Her primary combat ability involves firing tank rounds from her chest-mounted cannon with significant accuracy.

The surname "Hitoma" (比等間) combines Japanese characters meaning "ratio/proportion" (比), "equality/similarity" (等), and "time/space/interval" (間).