T-Cher privately tutored the children of the Green Lantern Brin for years before the Guardians of the Universe appeared and chose him to join the Green-Lantern Corps and train new recruits. T-Cher now trains in the use of power ring strategies, working in unison with Apros and Kilowog. He was quite pleased to see how well his students fared during the Sinestro Corps War, but has spent time grieving the heavy losses dealt to his former students.