Says "マロン" in the pixiv tags. There is no question.
Sure, let's just ignore the fact that this is obviously based on a specific moment in Majora's Mask, or the preceding image in the set not having any Majora's Mask trappings aside from the dimmer palette, or the next image in the set very obviously being of Cremia and Romani dressed as Link, or that there are, like, six other characters in the set who also go un-tagged (Aryll in #4, Makar in #5, Tatl in multiple pics, Tingle in #18, Pamela in #20, and Anju in #25, and to cap it all off, Link himself goes un-tagged, with a tag for Link/Saria instead).
I think a case could certainly be made against tagging this as Malon.