Sleipnir

It sounds like partly normal kitty play or territorial issues. It looks from your webshots that you have two kitties - are they both "indoor only"?

Did one come before the other? Is the mean kitty the "original lone puss" whose territory was violated by a newcomer?

Ritzy can be an "ankle biter" - and it is usually just playtime behavior, but since she has claws and teeth, it is not a good thing - we have found that taking the palm of the hand and GENTLY pushing her away with a strong NO has had the best results in keeping her from continuing. No swatting, that only results in further kitty retaliation--and kittys NEVER forget.

As to the night behavior, we initially closed our bedroom door - which created great kitty anxiety and "door banging"....we have since discovered that giving her the run of the house and the freedom to choose where she spends the night has resulted in a much more peaceful household. She is, however and only cat and an only pet, so we have more latitude here that some may feel comfortable doing.

I believe you do not force a cat to live with you, rather you learn how to co-exist in the cat's world - to some extent.