Zacharias (ザカリア Zakaria, Zechariah in the Japanese version) is a character in Fire Emblem Heroes.
Zacharias is a member of the Order of Heroes and the childhood friend of Prince Alfonse and Princess Sharena of the Askr Kingdom. He is the one who taught Sharena how to use a lance. He went missing during a mission in the World of Awakening.
After the mission in Paralogue 3: Blazing Shadows, Nino hands down a letter from him to Alfonse, which states that he went underground to investigate the Emblian royal family, also revealing that Veronica is not the true enemy, but rather Bruno, an Emblian prince.
By the end of Chapter 10: World of Radiance, though he still was never seen, Zacharias is, in fact, alive. He managed to save the Summoner from Veronica, giving them a chance to get through the gateway so that they can reunite with Alfonse, Sharena, and Anna while Zacharias holds Veronica off.
By Chapter 11: Rite of Shadows, Alfonse, Sharena, and Anna are told of Zacharias' murder by Bruno after an attempt to call out to him using a Rite.
During Chapter 12: Bitter Enemies, Alfonse, Sharena, and Anna encountered Bruno, who continued to remind them of what he told them in the prior chapter about how he murdered Zacharias. He even presented Zacharias's lance to the group. At the end of Chapter 12, Bruno is questioned by Alfonse and Sharena about if he is actually Zacharias after the Summoner spoke to Alfonse about the events at the end of Chapter 10.