Danbooru's insistence upon Japanese names for characters runs into trouble with franchises like Fire Emblem where a lot of Western fans don't even know what Gardevoir's Japanese name is.
Anyway, you're thinking of Elfi_(Fire_Emblem_IF), who is seriously undertagged because most users don't know that's her Japanese name.
Episode 9
has been updated!"Fire Emblem Heroes
Heroes' everyday lives"