A mister will not cool them but mat their feathers down so they can't cool off.
Provide deep, moist shade. Lots of shade.
Personality is up to the individual chicken and not breed specific. I've never had a calm and friendly wyandotte.
Don't kiss them, that's a good way to share diseases...
That's a very severe crossbeak. Unfortunately, it will get worse as she ages, and is usually a sign of other malformation. I'd put her down, I'm sorry.