In The Sacred Stones, who is Eirika's twin brother?

Ephraim is Eirika's twin brother in Fire Emblem: The Sacred Stones.

Ephraim and Eirika are the royal children of Renais, one of the nations on the continent of Magvel. When the Grado Empire invades Renais, the siblings are separated: Eirika escapes north toward Frelia, while Ephraim remains in the south and builds a resistance against the occupation.

Their campaigns give the game a branching structure. After certain chapters, players choose whether to follow Eirika's route or Ephraim's route, with each path offering distinct maps, events, and character development. The twins later reunite to defend Magvel's remaining Sacred Stones.

The siblings' closest friend is Prince Lyon of Grado, whose attempt to resurrect his father allows the Demon King Fomortiis's influence to take hold. Eirika and Ephraim must ultimately oppose Lyon and prevent the destruction of the Sacred Stones. Joshua, Seth, and Innes are important characters, but none is Eirika's twin.