Blue
A variant of Modern Game (Gallus gallus domesticus)

Representative Modern Gamephoto — a dedicated image of this exact morph isn't available yet.
Blue-feathered forms (e.g. Blue-Breasted Red) from the heterozygous blue gene, giving slate-grey dilution.
Keeper tips for this variant
Blue doesn't breed true — Blue x Blue gives ~25% black and 25% splash, so expect mixed-color clutches and select Blue-to-Blue or Blue-to-Black for yield.