all but nova just run if you disturb them, nova does too for a bit but then will go into a threat stance and if you try and touch her she'll bite. Because she's an old world Baboon it would be very painful.
Marzipan will let you do anything. You could stroke her and she either wont react or slowly walk away. You can handle her fine too, she'd never bite, if she did for some reason their bite is just like a wasp bite.
Fluffy can't be handled because she often flicks uricating hairs casually in her enclosure and she's jumpy, but again she'd run before biting.
Velvet is the same, jumpy thing, would bolt rather then biting, but again the bite isn't bad.
Spinny sometimes runs to her hide when I open the enclosure, sometimes she slowly walks toward to disturbance. I'm not sure how her bite would be, I'd imagine halfway between nova's painful one and just a wasp sting. Nova's can cause swelling, burning sensation, pain right up the limb, nauseousness, sometimes even heart palpitations. However no deaths have been attributed to any Tarantula, there have two incidents but both were the result of a skin infection they got afterwards as they were in 3rd world countries.