Taskmaster: Respectfully, I think most of his garb wouldn't fly, not just the white hood.
Spider-Woman: Skye's probably not her. I suspect her power's going to somewhere on the scale of a minor Phoenix. It would be nice to see Spider-Woman if only to hear Skye say "So did you just pick your name out of a comic book?" She'd probably end up being another Black Widow/Maye-esque character in terms of talents and position within SHIELD but with a much more outgoing personality. Hell, you could make her a slightly less irresponsible Archer with superpowers.
She-Hulk: I can definitely get behind this. Her origin and activity really isn't exactly worth a full movie, but could really work as a 1-2 episode arc. Hey, they could be assisting "Dr. Banner" on something more mundane (like moving him out into an isolated lab in the Rockies or something like that) with his Walters helping him out as the only family who didn't abandon him after whatever origin story is cannon now and who isn't Tony Stark (hell, he could be trying to keep the place a secret from Stark's more outgoing personality). An accident happens (and let's make it an actual accident), Walters is severely injured, and the bus and EMS are too far away or unable to get them (probably the later) and they perform a blood transfusion with the only person with a comparable blood type: Bruise. First episode is the set up, a second episode would be the aftermath as she adjusts to her new more-outgoing personality, excessive strength, and green skin.
Moon Knight: Maybe in a second season. We already got a roving maniacal billionaire to deal with.
The Sentry: I could see this as another "*knock, knock* It's SHIELD. Just making sure you aren't blowing something up" similar to a lower stake "Girl In The Flower Dress."
U.S. Agent: Maybe. I could see him as someone who pops in after Winter Soldier depending on how that whole thing turns out. Alternatively, perhaps he could be retired having served after Captain America disappeared during WWII. Would be a good opportunity for an "origins of SHIELD" Episode.
Baron Wolfgang Von Struker: He could pop up as the main antagonist of the second season who slinks away before they can finish him off. He would be perfect in that role given his mid-boss level stance are in perfect parity for the SHIELD Team. Could even make for a good SHIELD/Avengers tie in.
Blade: Even better: They could be approaching Blade as a specialist to get control of a minor vampire situation, who gives them some pointers before going after bigger fish. On a related note, there were three of those movies and a semi-okay TV show. They could get away with just "here's Blade" because odds are good that the majority of the audience already knows who he is.
Silver Sable: May goes up against her Symkaria counterpart is pretty much what that episode would be like. Hell, they could retcon Dr. Doom as a leader of a non-Nazi Hydra analogue whose sending agents/mercenaries to procure more-difficult to synthesize materials.
The Punisher: Another character that you could gloss over the origins of (or have him explain himself to Skye or May), I could see him and Shield cross paths when the mob accidentally (or "accidentally") get's their hands on a 084.