Lille Barro is the Quincy Sternritter designated "X" (The X-Axis) and leader of Yhwach's Schutzstaffel, the elite guard protecting the Quincy emperor. As the first Quincy granted a Schrift directly by Yhwach, he proclaims himself "His Majesty's masterpiece" and the being "closest to God." This conviction fuels his unwavering loyalty and self-perception as a divine messenger delivering judgment. He appears as a youthful, dark-skinned man with short white hair. A crosshair-shaped tattoo encircles his perpetually closed left eye. His attire typically includes a long white cloak, a bicorn hat bearing the Wandenreich emblem, and a furred pauldron over his right shoulder. His spirit weapon manifests as the large sniper rifle, Diagramm. His Schrift, "The X-Axis," confers two primary abilities: spatial piercing and intangibility. Activated through Diagramm, his attacks ignore obstacles and durability, piercing everything instantaneously in a direct line between the muzzle and target without a projectile. Opening his left eye three times consecutively in combat grants him permanent intangibility, allowing physical and energy attacks to pass through him harmlessly. His marksmanship is exceptional, enabling precise vital point targeting from extreme distances. Lille participates in pivotal battles during the Quincy invasion of the Soul King Palace. He confronts Squad Zero, defeating Senjumaru Shutara and Ōetsu Nimaiya. His intangibility and subsequent resurrection via Yhwach’s Auswählen make him a persistent threat. Later, in Wahrwelt, he battles Captain-Commander Shunsui Kyōraku. Pressured, he activates his Quincy: Vollständig, Jilliel (Divine Judgment). Jilliel manifests in multiple forms. His initial transformation encases him in a priest-like robe with eight green wings, each containing three holes. White intersecting lines mark his face, and a large halo (Heiligenschein) appears above his head. This state intensifies his spiritual pressure significantly. He fires destructive light beams—retaining X-Axis properties—directly from the holes in his wings; these beams can collectively devastate large city sections. He also gains teleportation. After surviving Shunsui’s bankai through resurrection, Lille assumes a second form. His appearance shifts to an owl-like, draconic cherub with elongated limbs, bat-like wings, and a body composed of light. New abilities include generating energy waves ("Ray of Judgment") from his limbs and creating a massive Reishi trumpet ("Trompete") to unleash city-destroying blasts. His near-invulnerability peaks, with only reflected attacks capable of harming him. This vulnerability is exploited when Nanao Ise’s Shinken Hakkyoken reflects his Trompete blast, shattering his halo. Deprived of divine power, Lille fractures into multiple flamingo-like avian clones. These entities retain limited energy projection but symbolize his fall from perceived divinity. Personality-wise, Lille maintains an aura of calm confidence rooted in his belief in Yhwach’s supremacy and his own divine mandate. He asserts that losers in battle fail due to slow comprehension and reaction. Paradoxically, he displays confusion when encountering unfamiliar phenomena. His defeat triggers intense rage and vengeful outbursts, leading to attempts at widespread destruction as compensation for his diminished state.