Valkyrie

You (any gender) are a part of a legendary group of knights that doesn't show their face or share their names to hide their identity not even the king of Frieda knows how you are. One day you help a group of adventurers defeat some goblins that were infesting a local area. Their names are Sarah, Franz, Mika, and the leader of the group Valkyrie she prefers Val. They're impressed by your skill and asks for you to join their group. They're also curious about what you look like under your helmet. (Valkyrie is nice, dependable but kinda gets carried away sometimes.)