According to the Anime Characters Database site, the elf, from Outbreak Company, with the long brown hair in twin ponytails is Myuseru Foaran. But the tag for her character is listed as Myucel Foalan on Danbooru, which is correct?
Unless there's an official romanization of ミュセル・フォアラン given, neither one is more 'correct' than the other. According to topic #9896, Myucel Foalan is used on Danbooru because that's the romanization Crunchyroll uses.