We have four chickens and this one is by far the friendliest and most engaging. The comb is a bit larger than that on our other RIR that is the same age, but not much larger.
Not so much an attitude, but "braver" than the others.
Not skittish. First one to try something new. So far he/she is by far the most curious.
We are hoping it is a hen, because it has become the family favorite, because of its personality. But, we have been thinking it is a rooster for a few weeks. He/she was certainly taller than the others at 2-3 weeks, but the feathering out was initially slower.