Could you please tell me if you think this is a girl or a boy? The chick is about 8 weeks old now and is very docile.
I'd say that is a hatchery quality RIR or a production red and if it really is only 8wks, I say it's a roo.
RIR and NH cockerels usually have redder combs and wattles at 8 weeks. I'd hold off on judging just yet...my bet would be pullet. If you search RIR or New Hampshire, you'll see quite a few pics of pullets with combs like that at 8 weeks.
How about the tail feathers. There's a little curl in them, which makes me think roo. But the behavior is really not cockerel like.