I second the bantam Cochin recommendation.
Also d'Uccle hens can be very cuddly (the roosters not so much). Actually I recommend that my kids never even hold the roosters.
Nankins are also very tame if you spend time with them.
Orpingtons are fine...they are a bit clingy though, and whiny. I switched to Black Australorps and they are great as well, but less clingy and quieter. Maybe you want clingy!!
Easter Eggers can be very friendly, or standoffish. You never know how they will turn out.
They have bantam EEs as well, that are quite cute but can be a little flighty or friendly also.
Silkies are of course always mentioned as a good kid breed. Silkie roosters can be chasing my kids across the yard, or friendly. The hens are fine.
So Cochins, Silkies, and Orpingtons are frequently mentioned on BYC as good kid-friendly breeds to have. Remember that roosters should not be kids' pets really...they can turn on you in an instant and go for the eyes, even after having them 2 years. Bantam roosters though are a lot less intimidating.
Silkies and Cochins don't lay many eggs. They go broody a lot and don't lay during that time either. So if you really need some eggs don't forget to include some nice Red Sex Links (Golden Comets, etc.) for eggs - they are really good at cranking them out. They can be a bit aggressive though, so if you add some hens later the Red Sex Links might be bullying the new ones while the Cochins leave them alone, for example.
Black Australorps are good egglayers too.