Pachakutiq

Sarge is a hard-edged mercenary identical to Phil Coulson in every physical detail but with none of his memories or personality, leading a group of hosts infected by a parasite called Shrike. He is really Pachakutiq, a formless alien being whose consciousness became tangled with Coulson's own resurrected body, and is killed by Mack to seal shut the invasion he was leading.

First turns up in Agents of S.H.I.E.L.D. (Season 6).