fujiwara no mokou and houraisan kaguya (touhou) drawn by takaku_toshihiko

Eirin and Kaguya's Daughter (?) Eirin did some genetic research on the side while experimenting on the lunar envoy. Since Eirin and Kaguya were lonely with only the two of them around, the former took the opportunity to discuss a certain idea with Kaguya. Enthusiastically, Eirin took her and Kaguya's DNA, combined them both, and created a little girl. She had silvery white hair and a beautiful countenance. The girl was friendly with Eirin, but rebellious when around Kaguya.　 Kaguya took issue with that, as she didn't like Eirin fussing all over the little girl. She ordered Eirin to kill her. Eirin took her to the forest and came back alone, having said that she had already done the deed. Several hundred years later... Kaguya met Fujiwara no Mokou. Her face reminded Kaguya of the little girl.

The Forbidden Secret Series

Palmtop Kaguya This cat is the product of one of the many resurrections of Kaguya, wherein she was possessed by the spirit of a cat while being reborn from a bamboo. Or at least that's the story Eirin told Kaguya. In actuality, she's a pet born from a clone capsule, where a clone Kaguya is combined with a cat. Despite appearances, palmtop Kaguya is not immortal -- she merely has a decent regeneration ability. Palmtop Kaguya is part of one of Eirin's collections. Said collection consists mainly of beautiful black-haired girls. It's a fetish point for Eirin. Fortunately, Kaguya does not know this.

Inaburger Sometimes Eirin's research would hit a snag. And when that happens, Eirin can be found entertaining herself by cooking junk food as a treat for Eientei's rabbits. The name "inaburger" isn't particularly well received. Its taste, however, is. Similar "moon-viewing" burgers with eggs in them can be found as regular fare on the moon. Presumably their popularity is because you can't actually see the moon while on it. As for the source of the meat, well, let's just say it's a mystery to the rabbits.

Inaburger