Nathaniel Malick

Nathaniel Malick is an ancestor of Hydra's Gideon Malick, whom the time-traveling Chronicoms need dead in order to erase Hydra's rise from history -- meaning S.H.I.E.L.D. has to protect an enemy's bloodline to save its own. He is defeated by Daisy Johnson in the series finale.

First turns up in Agents of S.H.I.E.L.D. (Season 7).