What breed is my rooster!? Thanks!

[RoostersAreAwesome]

Agreed. Wouldn't necessarily rule out Mystic Onyx it it happened to have five toe's although it looks to have more of a mulberry rather than fibromelanistic face

That’s definitely another possibility, I forgot about that breed for a second

 

[Rhodebar Lover]

He xould be a 'mystic maran' or some other melanistic designer breed.

I agree with nuthatched.

Mystic Marans are not fibromelanistic. They are just sexlinks of a Black Copper Marans with a Barred Rock. As sexlinks, males are barred. This bird is a male and clearly not barred making him absolutely not this mix.

 

[Yard Farmer]

Mystic Marans are not fibromelanistic. They are just sexlinks of a Black Copper Marans with a Barred Rock. As sexlinks, males are barred. This bird is a male and clearly not barred making him absolutely not this mix.