What breed am I?

[Chip_Chip_The_Rooster]

I see cuckoo, wheaten and black copper marans. Nothing blue

You are correct. However the sapphire gems and the sapphire olive eggers look close. The sapphire olive egger looks really close, but mine do not have floof on the top of their heads.

 

[MysteryChicken]

Only an example.

They don't have Japanese Bantam listed on their site, but show it as an option in their Hatchery Choice bantam assortment.(Pictured), but they don't list it as a possibility.
So, who knows?