Lopez, sometimes known as Lopez the Heavy, is the Red Team's Spanish-speaking robot mechanic.
Sarge built Lopez out of a robot kit provided to Red Team, but failed to ground himself when installing the speech unit, with static electricity causing the speech unit to be stuck on Spanish. Therefore, although Lopez can understand English easily, he can only speak in Spanish.
Lopez considers himself to be severely underappreciated by the rest of Red Team, in large part because most of the time, none of them can understand a word he says. Although he was built by Sarge, he hates him (and just about everyone else).
Despite this, Lopez is a capable mechanic and engineer, frequently building immense structures in miniscule periods of time (such as the holographic chamber underneath Red Base in Valhalla) or repairing nigh-unfixable vehicles.
more to come when I'm less lazy...