Lambdadelta is one of the fictional characters from Umineko no Naku Koro Ni series. Lambdadelta is another witch who fought Bernkastel in a "game" in the past. Her name and appearance hint at her being connected to Miyo Takano from Higurashi, leading to the possibility that the "game" she played with Bernkastel was the world of Higurashi with the battle between Rika and Takano being the purpose of the game. This character is popular among cosplayers. It can be portrayed by wearing cosplay Lambdadelta costume and cosplay Lambdadelta wig. This character is always present in an Umineko no Naku Koro Ni cosplay.