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Hikariko is some kind of humanoid creature that's thought to be a fairy who attacks the heroines twice on stage 4 of Lotus Land Story and what appears to be the same character on stage 3 of Mystic Square. In the former game, she appears in Mugenkan when Reimu Hakurei or Marisa Kirisame enter the mansion and attacks. She re-appears again later for a rematch, using the same techniques of danmaku.
However, she re-appears in the latter game as soon as the heroine (including Mima and Yuuka Kazami) enters Makai and attacks them there. Once she's finished with firing her danmaku, she'll fade into the background and come back a second later directly above the player and shoot more bullets, but can only be defeated once. Since she's got no dialogue with the player on both games, nothing is known about her.
It may also be referred to as the "LLS 4th Stage Midboss" (幻想郷四面中ボス) or the "MS 3rd Stage Midboss" (怪綺談三面中ボス). Japanese fans tend to call this character "Photon" (光子 Hikariko).
The sprite of her in Lotus Land Story shows that she has short purple hair, a yellow dress with a bow, green shoes, a big green bow on dress, and has very light transparent wings that might be attached to her arms. She has a pink hat with a long ribbon attached to it and has yellow sparkles around her. Her sprite in Mystic Square is just as same as Lotus Land Story's, but her hat with a long ribbon is now gone.
- She is noted for being the only nameless character in the Touhou Project to appear in more than one game. Daiyousei is excluded since her name have been used by ZUN as a term.
- She may have some kind of relationship with Yuuka Kazami due to being in Mugenkan. However, she's seen in Makai attacking Yuuka, which makes this possible relationship ambiguous.