Well, as term 'anime' it could also here mean 'hentai' story so general rules of that sort shows follow. Anycase I have got craving naughty story based on Omamori Himari.
Wikipedia link to anime series; http://en.wikipedia.org/wiki/Omamori_Himari
And youtube links to first episode;
(part 1/3)Omamori Himari Episode 1 part (1/3) sub
(part 2/3)Omamori Himari episode 1 part (2/3) sub
(part 3/3)Omamori Himari episode 1 part (3/3) sub
Anyway I do not want copy the chars in the series. Only basic quality the main male char (my char) is shy/virgin man and I want mostly the center romance (or trio) between him and his demon cat girl bodyguard (and the mortal human childhood friend). You can self-develop your bodyguard but would prefer she is cat girl (ears and tails) or other furry adorable 'animal' demon.
Now there is posibillity this could be harem story but it would mean either female char who can run several chars who end up cat fight over the guy or several female writers working together with me. Most female cast would be 'demons' or other supernatural beings. Also as usual with hentai/anime it would include humorous (silly) moments but also some serious plot developments besides relationship between the chars.