Demeter was given to people, I think, so I don't think he can get her anymore.
Attar is technically available, but it's just very unlikely that you'll find her.... yeah, fine. I'm not entirely sure about the first two, since although they do more damage than the usual R, it's probably about the same damage output as literally ANY SR...
Kamadeva is fair enough. A high roll Hime, who would be SSR level if the debuffs were reliable. Buuuut the average result is probably not very impressive.