15. Frank Castle (Punisher)
It is much more likely that he will receive his own television project or will be a part of the recently announced Netflix Daredevil series. However if a man in a costume is going around killing people, Coulson's team would most likely be the ones to get involved. Tying Frank Castle to S.H.I.E.L. could create some interesting stories.
14. Frank Payne (Constrictor)
A street level supervillain that could be done on a TV budget. Constrictor is a fun villain, he is not going to rule the world but he is a competent threat. Would be a fun one shot episode.
13. Joseph Green (Gauntlet)
One of my all time favorite comic book series is Dan Slott's Avengers: The Initiative. The series focuses on a boot camp for young superheroes. The character of Gauntlet is the drill instructor. Could easily have Green show up as a soldier before he becomes a superhero. This is a great character that could use more exposure.
12. Abigail Boylen (Cloud 9)
The breakout character from Avengers: The Initiative. Cloud 9 is a teenager that loves having superpowers but does not want to be a superhero. This could be a fun mission. However I may just have a soft spot for there character, as I also included her in my fantasy Avengers lineup.
11. John Walker (USAgent)
John Walker longed to honor his soldier brother and in the comics he got his chance when he replaced Captain America for a short while. Agent is a well meaning soldier who is difficult to work with. Could be a no nonsense S.H.I.E.L.D. agent.
10. Eric O'Grady (Ant-Man)
The third Ant-Man is the worst of them all. Eric O'Grady was a terrible, selfish S.H.I.E.L.D. agent who became an irredeemable superhero. Even if he is just included as a nod to the fans he could be a fun recurring character.
9. Jessica Drew (Spider-Woman)
The TV series is the perfect backdoor pilot for a Spider-Woman vehicle. Double triple S.H.I.E.L.D./Avenger/HYDRA agent could fit in with this series and spin into her own adventures.
8. Jimmy Woo
S.H.I.E.L.D.'s best interrogator. The character is a relic from the 1950s and having a Cold War agent on the show could be fun.
7. Daisy Johnson (Quake)
Teenage savant and superhero. A fan favorite character who could easily join the team.
6. Jennifer Walters (She-Hulk)
S.H.I.E.L.D. could veer into a legal drama for an episode or two. When they need legal advice or to be represented in court they should go to someone who has familiarity with both the law and superheroics. Could be a great way to tie the series into the Hulk mythos. As ridiculous as this character seems on the surface she is one of Marvel's best.
5. Bobbi Morse (Mockingbird)
When Hawkeye and Black Widow are busy who else can S.H.I.E.L.D. go to?
This is an episode that needs to happen. The Taskmaster invades the helicarrier and takes it down just because he can.
3. Rick Jones
A cornerstone of the Marvel universe who never gets used in movies or TV. Rick Jones seems like the type of resourceful adventurer that would attract S.H.I.E.L.D.'s attention.
2. Abigail Brand
When it comes time to tie into Guardians of the Galaxy this character needs to join the series. The head of S.H.I.E.L.D.'s space division is one of Marvel's most popular new characters.
1. Henry Peter Gyrich
Can't believe that Marvel has not utilized him yet. The bureaucrat that makes trouble for superheroes is a different kind of adversary and would fit in a TV show perfectly. A great character role that would be a lot of fun.