Ehhhhh, I think roo. He's too light to be a pullet, and his comb/wattles are too red for 12 weeks. There's still time for the saddle feathers/hackle feathers to become more obvious.
Females barring is white on a black feather and males are black barring on a white feather...unless the roo is not homozygous (2 copies of the barring gene) and is heterozygous meaning that he only has one copy of the barring gene then he would be colored like a female with white on black.
*ETA* look closely at his tail feathers....the longest feathers....see how they are curving out and over the shorter tail feathers below them. Rooster
Looks like he is going to be a handsome boy when he grows up.