Lefil, also sometimes referred to as Refill, is a character from the anime Kuromukuro. He serves as the leader of the Gezon-Reco Frontier Force, a unit within the extraterrestrial organization known as Efi Dorg. Lefil is of a species that can be cloned; he is revealed to be a clone of the same species as another character named Zeru. He pilots an extra-large geoframe that does not have a code name but is capable of merging with a unit called Lock Head. His geoframe is equipped with four flexible, metallic blade tentacles that he uses in combat.

In terms of personality, Lefil is initially portrayed as a mysterious and competent commander who carries out the objectives of Efi Dorg. His primary motivation aligns with his organization's mission to collect fragments of the Pivot Stone and subjugate Earth. However, his role shifts when he is stabbed and subsequently brainwashed by Zeru, who forces him to attempt to stop the activation of the Kururu. Lefil warns that if the Kururu is not stopped, a larger Gezon-Reco Squad will arrive. This indicates that he retains some awareness of the consequences even under coercion.

Lefil's role in the story is that of a recurring antagonist leading the alien assault on Earth. He engages in multiple battles against the protagonists, who include Kennosuke Tokisada Ouma, Yukina Shirahane, Sophie Noël, Tom Borden, and Muetta. His key relationships are primarily adversarial, with a notable subordinate dynamic to Zeru. During the climax of the series, Lefil combines his geoframe with another unit in a final counterattack, but the combined mecha is defeated through the teamwork of the main characters. Lefil manages to escape the immediate destruction, but dies when the geoframe is ultimately destroyed. His journey from a capable commander to a brainwashed pawn and finally to his downfall highlights his development as a character who is ultimately a tool of the larger Efi Dorg hierarchy.