Transformations in "AGENTS OF S.H.I.E.L.D."

Below are examples of characters from ABC's "AGENTS OF S.H.I.E.L.D." who underwent transformation, while acquiring enhanced powers:

TRANSFORMATIONS IN "AGENTS OF S.H.I.E.L.D."

Mike Peterson

Deathlok

Raina

Inhuman Raina

Dr. Andrew Garner

Lash

Skye aka Daisy Johnson

Quake

Could someone explain why three characters portrayed by actors/actresses of African descent on ABC's "AGENTS OF S.H.I.E.L.D." had to undergo such drastic physical changes when they became enhanced beings, while the fourth character - someone NOT of African descent, only underwent a name change and haircut when she became an enhanced being?