Ganesha

MoonCancer-class summoned by Ritsuka Fujimaru in the Lostbelts. She is a Pseudo-Servant imbued with the Divine Spirit Ganesha, the Remover of Obstacles and the Hindu God of Beginnings, Success and Wisdom; being a son of Shiva and Parvati. Ganesha forcibly fused with Jinako, altering her Saint Graph on conceptual level to fuse with her with only reason being that they are compatible. And due to this, everyone will refer to her as Ganesha and no one will recognize her, even by her previous servant Karna. (Source: TYPE-MOON Wiki)