Maurice

Maurice is an orphan adopted by Eureka. She found him under a pile of corpses during the massacre at Ciudades del Cielo. Maurice is mature for his age — he's the only one who ever suspects that adults may be misstating the truth to keep the children calm, and he's the most sensitive to Eureka's moods. Maurice knows exactly what happened to his old "mama" though he doesn't seem to harbor any ill will toward Eureka, actually embracing the change (to an extreme at some points). Throughout the series, Maurice is the one who accepts Renton the least, despite occasional acknowledgement of Renton's achievements.