The Luminoth G-Sch was one of the ten Keybearers sent to collect the Sky Temple Keys. He is called "gentle" by A-Kul. He was trapped by the Ing and slain in battle in the Catacombs of Torvus Bog. Before his defeat, he stood against their leader, whom he called "a foe worthy of a Luminoth Warrior." Samus later recovers his key in the Dungeon of Dark Torvus Bog.
- "Gentle G-Sch. With a Bearerpod he sleeps in a flooded temple." —Metroid Prime 2: Echoes Logbook "G-Sch's Key" (Metroid Prime 2: Echoes)
- "What craven savages are the Ing! Trapped in the catacombs with no chance of rescue, I fought them to the last. I watched them feed upon their dead. I heard them pressing the lesser of their number into the front ranks, that my blasts would take them. At least their leader stood against me in battle. He was a foe worthy of a Luminoth Warrior." —Metroid Prime 2: Echoes Logbook "G-Sch's Testament" (Metroid Prime 2: Echoes)