The individual heroes known as the "Marvel Knights" to the read do not pose a direct threat to Norman Osborn and H.A.M.M.E.R. But Norman Osborn knows the power dissent can attain, before these heroes can gain a following, or are allowed to become Martyr's. Osborn decides to nip the problem in the but before it grows, so he repurposes the Thunderbolts as his personal attack dogs for the anti-establishment heroes. They are tasked to hunt down the street level heroes, and discreetly take them out, be it alive or otherwise.
Mister Fear (Leader)
Osborn isn't just going to resign Ryker's to Mister Fear, he busts in with a full encompment of H.A.M.M.E.R. agents and delivers Cranston an Ultimatum, lend his services as Mister Fear to Osborn for the new Thunderbolts, or be incarcerated for life in a proper prison with no acces to his Fear gas. He accepts the offer when he finds out that he'd be hunting down heroes like Daredevil like dogs.
Silver Sable
A-level mercenary Silver Sable is not one to hunt down a hero, but she is still a mercenary, and she'll accept any job given a large enough pay-check, and Osborn's limitless funds, cement her in the line up. It's nothing personal, simply business with her.
Aborbing Man
After his countless defeats at the hands of super-heroes, Creel developes an obsession with hunting down these heroes, a very public skirmish with The Prowler (ends up hospitalized) brings Creel on Osborn radar, Osborn offers him the job, Creel jumps at the oppurtunity.
Black Spectre
Hospitalized after his recent encounter with Moon Knight, Spectre was taken into S.H.I.E.L.D. custody, he was transferred over to H.A.M.M.E.R.'s custody after the regime change, Osborn offers to heal him completley, and offer him a place on the team to hunt down the one that did this to him. Spectre is only in it to get at Moon Knight, but thrashing some other heroes is something he's more than happy to tag along for.
Vienna
Shang-Chi has taken up a pacifistic protest against Osborns rule, Osborn tried to confront him by sending Hawkeye to take him down, Chi makes a fool out of him by simply dodging, blocking, and countering everything that get's thrown at him, he's becoming a major dissenting figure in the media. Osborn turns to someone who has spent plenty of time dealing with Shang-Chi, now serving as a mercenary, Vienna wins Osborns attention. She's your typical femme fatale character, I wanted to pick someone from Shang-Chi's rogue's gallery, so there she is.
Kraven III
After his recent encounter with the Punisher, the recently demented Alyosha Kravinoff is picked up by H.A.M.M.E.R. off the coast of the Savage Land, knowing the hunting and tracking skill a Kravinoff posseses Osborn offers him the job so he can regain his freedom.
Typhoid Mary
After going Awol from the initiative she has been picked-up again by H.A.M.M.E.R., demanding release gets her nowhere, but when Osborn offers her freedom if she joins the team, she reluctantly accepts. Her schizophenia really lends her to an angle like this she can go from reluctant, and hessitant to, a cold blooded killer at a moments notice
Mister Eleven
Nobody knows he's on the team, not even Osborn, Mister Eleven is a body-snatcher with no corporeal form to call his own. He's after something that H.A.M.M.E.R. posseses, and he's found an in by body snatching with Absorbing Man, to find what he's looking for he'll jump from character to character, hero, villain, civilian, whatever, now that the success of the Thunderbolts is beneficial to him, he'll partake in the actions for as long as it is necessary.
Scimitar
Another Mercenary, proficient with a sword, master hand to hand fighter, despicable in nature, Osborn hires him for his history with Iron Fist, and the fact that most street-level heroes are master hand-to hand fighters. He's just in this for the money, he couldn't care one way or another who gets hurt, or even if they win, as long as he's getting paid, he'll do his job.
Writer: Zeb Wells, he always impresses me, especially his handling of street-level characters.
Artist: Clay Mann, a rising talent, he did great work in the recent DR:Elektra series, regardless of the story keep an eye on this guy.