![1girl alter_servant alternate_costume animal_ears bare_shoulders bow breasts cleavage dark_persona detached_sleeves fate/extra fate_(series) fox_ears fox_tail full_body groin hair_bow hair_ribbon highres hwoking japanese_clothes large_breasts long_hair mask original pink_hair ribbon solo tail tamamo_(fate)_(all) tamamo_no_mae_(fate) tattoo thighhighs transparent_background twintails yellow_eyes rating:s score:7 post #2159380](/cdn_image/preview/20/45/2045a9780306facf2efb16e49ba63922.jpg)
Theoretical fan-designed dark persona version of a character who has been corrupted by the mud of the Fuyuki Holy Grail from Fate/Stay Night, similar to canon examples like Dark Sakura or Saber Alter. Fan examples of "alters" include Archer Alter, Lancer Alter, or the "Sabatsugu" version of Emiya Kiritsugu (not to be confused with Emiya Kiritsugu (Assassin)).
Common traits of an Alter version of a character include white hair, red eyes or yellow eyes, pale skin, and visible red veins of corruption. Alter characters will also typically be dressed in an alternate costume with darker colors or stripes of black and red.