Neko-nin is (except for a couple of places, namely when the protagonist has trouble decoding a pictogram and the final fight sequence), generally light-hearted and quite funny. Nekopara, whilst having funny moments, is generally more emotional, especially regarding Milk
Both VN's cover societal problems with regards to catgirls (in Nekonin, it's one of the reasons why the protagonist gets attacked at the end), whilst Nekopara covers it all in a fair amount of detail (and the consequences of breaking the rules) - even when catgirls are fully integrated, there are still places that they aren't allowed to go (and don't feel safe going on their own). In Volume 3, it also deals with general and personal prejudices (the protagonist nearly gets into a fight when his catgirls are insulted). Hypersexuality is also covered (one of the sadder sections)
It's a bit like Alien Nation in that regard...
In Nekonin, with the except of Tama and Yuri (who are - as you would expect - totally in love with the protagonist), most of the characters don't particularly like him (including his mother, although it could be insinuated that she has her reasons). It's only towards the end of the DLC's that they start to like him, and by which time Yuri has solved her problems with her sister.
With Nekopara, all the characters (including the protagonist) have pretty deep-rooted problems: Fear of abandonment, rejection, jealousy, regret and a whole host of other problems.
In both you do have to wonder how idiotic the protagonist can be, especially when they should be able to see what's going to happen. In Nikonin, the protagonist is generally kind-hearted, especially after getting used to his situation. In Nikopara, he can come across as something between cold and indifferent (especially at the start), with his sister having to sometimes offer advice, although he does care for the catgirls.
In the OVA, he does come off as nicer person though.
Edited by MrTAToad2 (Mon 01-Jan-18 03:42:35)