Guillermo Portero is the CEO of LumériCo. Before that, he was the president of Mexico and a soldier before that.
In the article LumériCo Vision for Mexico Unveiled, but Threats to Safety and Security Remain, Portero announces the completion of the nuclear power plant in Dorado.
During the Sombra ARG, Portero's emails were leaked to the public by Sombra, revealing his bribing of government officials, plans to seize private property, and ties to the Vishkar Corporation. Portero denied these accusations in the article LumériCo Revelations: CEO Guillermo Portero Under Fire, but would eventually step down temporarily (as detailed in LumériCo CEO Steps Down) after mass protests.
- Portero was the first character to be revealed as canonically homosexual.
- A statue of Portero can be found on Dorado.