Agents Of SHIELD: 8 Characters Who Need To Return In Season 6
2. Felix Blake
Last Seen: Season 3
After sitting out season two following the breaking of his spine by Deathlok in season one, former S.H.I.E.L.D. agent Felix Blake returned in season three, revealed as the leader of the hate-mongering group the Watchdogs. Despite his hatred of Inhumans, he was ultimately manipulated into providing the warhead that Hive would later attempt to use by season's end.
Unfortunately, that was the last we ever saw of him, the character disappearing back into the shadows, though the Watchdogs themselves continued to make their presence known all the way through the end of the fourth season under the leadership of Anton Ivanov, better known as the Superior.
Though the Superior made a return late in season five, the Watchdogs' ongoing existence hasn't really been touched upon, let alone how or if Blake is still involved with them.
Considering hate groups will always exist, it's hard to imagine our heroes managing to successfully "end" the Watchdogs, but Blake - at the least - deserves to face justice for giving rise to them in the first place, and hopefully when all is said and done, the gang can have the satisfaction of seeing that come true.