I imagine someone's going to point out that rabbits are so individualistic that you can't rely on any generalizations about personality based on breed, and there's some truth to that. However, I've had two mini-rex rabbits, and both have been very intelligent and packed with personality. The same has been true of all of the mini-rexes I've met over the years.
That's not to say that Scone and Natasha had the
same personality - in many ways they were very different - but they had and have very
definite personalities, with very strong likes and dislikes and attitudes. Neither one of them was the slightest bit reluctant to let me know what they thought, either.
The degree to which a given bunny is timid or aggressive (I'd think of it more as being reserved or outgoing) is one of those things which does vary a lot. Scone was very outgoing and friendly toward newcomers. I'd take him to Cub Scout meetings, and he'd love to be petted by all the little hands and have them feed him parsley or hay. If someone new came to the house, Scone would run out to see who it was and if they would make friends. Natasha is much more reserved. It takes her a while to approach someone she doesn't know, and if she smells a dog on someone (including me) she'll thump and run away and hide.
As to "what is affectionate from a rabbit", it depends on the rabbit. Rabbits kiss just like dogs, but whether or not an individual rabbit is a kisser is very variable. Both of mine were, I know many who are not.
Rabbits will show affection just by wanting to be near you and see what you're doing. Whatever room I'm in, so is Natasha. She sleeps next to my bed (or in it, sometimes). If I sit on the floor or on the sofa she'll jump into my lap and kiss my hands, or she'll sit next to my chair and demand petting (when a rabbit runs up to you and puts its head down, that's a demand for petting - you'll need to figure out how they like it, but I'd start by running the back of your fingers from the nose up the forehead). Some bunnies like you to stroke their ears, others hate it.
That's half the fun of a rabbit, figuring out their individual personalities.