Astolfo is the Rider class servant from Fate Apocrypha, adapted from the light novels into anime in 2017, and later widely played in Fate Grand Order. Based loosely on a paladin from the Matter of France, this version became famous online for a cheerful personality, pink hair and an androgynous look that inspired countless memes and fan art. The treasure line reflects how fans talk about the character in posts and edits, as a shorthand for affectionate praise that spread through anime communities, Discord servers and short video edits.