Lops and Cy form an inseparable twin pair, rescued as defective runts rejected by their Cyclopean clan for functioning only as a single unit. Serving Leonhart's palace after his intervention, they stand 20cm tall as small black anthropomorphic beings. Lops features a large mouth and small feet, while Cy has one light-purple eye and diminutive arms. For sleep, Lops dons an orange nightcap with yellow polka dots and cat ears, switching to a plain green bowtie when formal.

Lops acts as the vocal communicator, often ending phrases with "-nanoda," while Cy processes visuals and relays non-verbal cues to Lops. Though Cy holds slightly sharper intellect, Lops exhibits more expressive precociousness. Both despise cruelty and cherish kindness, especially toward Sariphi, whom they deeply revere. Their loyalty to Leonhart, rooted in his rescue, fuels their roles as Sariphi's protectors and companions.

Initially trembling at Sariphi's audacity toward Leonhart, they later became her unwavering allies, confiding their clan abandonment to strengthen their bond. A decade onward, they persist in palace duties, like pursuing Leonhart and Sariphi's son Richard to his lessons. Their birthdate is February 2 under Aquarius. Biologically genderless, Tetra uses male pronouns for them. No details exist regarding their presence in spin-offs, films, or OVAs beyond the main series and epilogue.