My characters purr pretty much in the quote C'kayah just gave. Even my Hyur!
As for body language and other things, I tend to follow the kitty tropes since they fit best. I also try to adjust based off the situations, especially with their ears. More often then not I default to the shifting back of the ears for when they're anxious or stressed.
I also love playing around with tails. Xelra loves to entwine her tail with her mate's when they're standing close to one another. She also does it with her sister on occasion, and for her it's a sign of affection and trust. Her tail is overtly sensitive otherwise so letting anyone touch it or come near it is a big deal for her.
As for body language and other things, I tend to follow the kitty tropes since they fit best. I also try to adjust based off the situations, especially with their ears. More often then not I default to the shifting back of the ears for when they're anxious or stressed.
I also love playing around with tails. Xelra loves to entwine her tail with her mate's when they're standing close to one another. She also does it with her sister on occasion, and for her it's a sign of affection and trust. Her tail is overtly sensitive otherwise so letting anyone touch it or come near it is a big deal for her.