I say PULLET, Too Dark to be a Roo... , I mean we are looking at a Barred Rock right? We have Barred Rocks and all of them but the roo are dark like this one here... our roo is lighter on the colouring of the feathers...
If you're looking for an unrelated boyfriend for her, I bet I could find one about the same age. Oh, but you live in town and can't have any roosters crowing, can you?
I don't have marans, but I tend to agree with ChickenLittle - the comb & wattles are kind of big for most 8 week old pullets - I think it's more likely to be a roo (if it is definitely 8 weeks old).
These are my leghorn & RIR pullets at 8 weeks (leghorns usually have large combs):
These are my BRs at 8 weeks (notice the lack of wattles on these chicks & the ones above):