Brock Rumlow—Crossbones

Continuing with the trend of publishing characters we probably won't be seeing again anytime soon, let's look at Crossbones. Famous in the comics for killing Captain America, his role in the MCU is slightly different...

Name: Brock Rumlow
Race: Human
Experience: 100 (Legendary)
Power Level: Pulp Hero (15 PP)
Agility d8; Smarts d6; Spirit d8; Strength d10; Vigor d8
Pace 6; Parry 8; Charisma –2; Toughness 14 (6)
Hindrances: Death Wish (m, kill Captain America), Ruthless (M), Stubborn, Ugly, Vengeful (m)
Edges: Arcane Background (Super Powers), Brawny, Quick Draw, Steady Hands, Marksman, Combat Reflexes, Dodge, Two-Fisted, Improved Nerves of Steel, Frenzy, Take the Hit, Strong Willed.
Skills: Fighting d12, Intimidation d6, Knowledge (Battle) d4, Notice d6, Shooting d10, Stealth d6, Streetwise d6, Taunt d6, Throwing d8, Tracking d4.
Inventory: Battle armor (Armor +6), SIG Sauer (2d6, AP 1, 12/24/48, Semi-Auto, 12 Shots), gas mask, comms unit, bomb vest, magnet grenade (3d6, 5/10/20, MBT, sticks to metal surfaces: roll at –6 to pull off).
Powers:

• Armor +6 (1): Partial Protection (–1). Device (–1, advanced body armor).
• Attack, Melee (5): Damage Str+2d6, Multiple Attacks. Device (–1, piston gauntlets).
• Super Edge (4): Improved Nerves of Steel, Take the Hit. (Fried nerve endings.)
• Resistance (1): Electricity. +4 to resist effects, +4 Toughness. (Fried nerve endings.)
• Toughness +1 (4): Hardy. (Fried nerve endings.)

Brock Rumlow was a S.H.I.E.L.D. agent and leader of a STRIKE team, working with Captain America and Black Widow fairly often, including recovering a weapon known as Zodiac and the recapture of the Lemurian Star.

Winter Soldier Inventory: Steyr AUG A3 (2d8, AP 2, 24/48/96, RoF 3, Auto, 30 Shots), Suppressor, SIG Sauer (2d6, AP 1, 12/24/48, Semi-Auto, 12 Shots), comms unit, kevlar vest with inserts (Armor +3, Armor +6 vs ballistics, –4 AP vs ballistics), stun wand (Vigor or incapacitated), combat knife (Str+d4, 3/6/12).

Rumlow is a master martial artist, marksman, and tactician, instrumental in a variety of S.H.I.E.L.D. operations. Unfortunately, he is also an undercover HYDRA agent. After the assassination of Nick Fury, Rumlow was tasked with bringing in Captain Rogers, though he was unable to do so several times, even with the help of the Winter Soldier. During HYDRA's uprising, Rumlow helped secure the launch codes and keep S.H.I.E.L.D. off HYDRA's back as they did what they could, even engaging in hand-to-hand with Sam Wilson. Unfortunately, he was taken down by a collapsing building after Project: INSIGHT helicarriers crashed into it.

This didn't kill him, however. Rumlow went off the grid and disavowed HYDRA, instead working for himself and his small team of mercenaries, just itching at a chance to kill Steve Rogers. That chance came in Lagos, Nigeria almost two years later, where Rumlow led an attack on an Institute for Infectious Diseases. After isolating Captain America, Rumlow went all-out in his new battle suit to try and wear the Captain down, before attempting to distract him and detonate the explosives strapped to his chest and take Steve with him. While the suicide bombing didn't take out Captain Rogers, it did kill over a dozen innocent civilians, and sparked the creation of the Sokovia Accords.
—DoctorBoson