Leeron Littner

left|thumb|274x Leeron is fairly flamboyant and openly, stereotypically gay. This often played as comic relief in the series, with Leeron often taking his campness to ridiculous levels just for the sake of freaking people out. Despite this, Leeron is a very rational and intelligent person and more than capable of being serious when he needs to be. Leeron is also one of the most loyal members of Team Dai-Gurren, being the only adult member of the team (other than Kamina) to never doubt Simon; while the majority of the team seemed completely shocked by Simon's recovery after Kamina's death, Leeron was simply smiling as though he knew Simon would make a comeback the entire time.

Despite not specializing in combat or fighting ability, Leeron is lauded for his intelligence and creativity and is vaunted as the most intelligent human in the series by Lordgenome himself. His genius allows him to create and modify vast machinery into a variety of forms and explain the abstract phenomenon that occurs in the Gurren Lagann Universe. He's noted for being the one who educates the rest of the cast on peculiar happenings and has been responsible for the many scientific breakthroughs that have been yielded by Team Dai-Gurren. According to Leeron himself, the human race owes their intelligence and aptitude to their own Spiral Power considering with the span of seven years they went from being dysgraphic and illiterate to programming interstellar machines.