Silvia Goldberg is the No. 1 American player of the fighting game series Galaxia Heroes. She is the "antagonist" of the GGC arc.

Silvia is a professional gamer with as much skill as arrogance. Silvia is obsessed with Metius, a hero character of the fighting game Galaxia Heros. She even belives she actually is the hero Metius. Silvia also has a romantic obsession over Kei Uomi, beliving because they competed against each other in the fighting game Galaxia Heros they are in the early stage of a romantic relationship.

(Source: Shangri-La Frontier Wiki)