Ganache (EntityTopic, 7)
From Compile Worlds
Ganache is an important sub-villain in the Neptunia series. He heads up the technical division of Avenir, sending killer robot after killer robot against the protagonists - so many of them that both of the game's rescue scenes involve some of them being blown up, first by MAGES. and later by MarvelousAQL.
He is fanatically obsessed with the woman he calls White Heart, but this is actually Fake White Heart, i.e. Arfoire in one of her many disguises. Shortly after this fake disappears, Avenir gets broken up by the protagonists, and Ganache also disappears, obviously mourning his loss.
Canonically, he turns into a good guy at the end of the game, much like Singe did as soon as Avenir was broken up, but in Compile ♥ Worlds, he returns as an evil presence once again. He may have some position of power in Mois Praline, and he's also shown to be able to give orders to Fresa, a member of the Neapolitan Trio.
Etymology
Ganache is a glaze usually made of chocolate for filling. Who knows what link the character has to this though, other than his hair being brown like chocolate.