typhon epsilon (fate)
A character in Fate/Grand Order, resembling Typhon Ephemeros' first ascension but with blue hair and blue eyes. It's available as a costume dress for Typhon Ephemeros.
In the Rakurui no Tsubasa event, it is revealed that due to Ephemeros's anti-wish nature, she wished for Epsilon to be created to allow wishes to be made. To prevent the wish from from being rejected, Ephemeros would then completely forget about Epsilon.