Gahiji is from the planet Kirinyaga in the 31st Century.
When his super tracking abilities emerged, Gahiji spent many years tracking in the outer worlds. He considered himself to be possibly the best tracker alive, until he met the Legionnaire Dawnstar, who bested him. Seeking to become as good as, if not better than Dawnstar, Gahiji enrolled in the Legion Academy. There he hoped to learn how to better use his abilities and perhaps someday join the Legion of Super-Heroes as Dawnstar had many years ago. While a student at the Academy, Gahiji adopted the code name Mwindaji.
While Mwindaji was still a student, he and fellow student Otaki were secretly recruited onto a rescue team organized by their teachers Bouncing Boy and Duplicate Damsel, along with the Legionnaire Star Boy. Their mission was to rescue the Legionnaires Brainiac 5 and Dream Girl from the Dominators. On the mission, Mwindaji used his powers to quickly locate the captive Legionnaires on the Dominators' planet, and to locate Brainiac 5's stolen force shield belt.
After the mission, Duplicate Damsel complimented both Otaki and Mwindaji on surviving the mission before they returned to the Legion Academy.