Sebastian Stark (MCU Redux)

Steven Sebastian “Seb” Stark, known simply as Sebastian Stark, is the brother of Anthony Stark, technical savant and former Marine that aided the behind-the-scenes operations of Stark Industries for a number of years. Anthony and Sebastian were different from one another in that Seb avoided the spotlight, letting Tony be on the magazine covers and tv shows. Sebastian lacked the charisma and After his brother was kidnapped by the Ten Rings, Sebastian helped Tony move the company in a new direction and helped develop the Mark II Iron Man Suit. After Tony’s bout with Obadiah Stane, Sebastian continued working at Stark Industries as Tony’s partner in his pet projects, such as new suit models and subtle aids in the field of Arc Reactor technology. The Starks were soon challenged by Ivan Vanko, a vengeful Russian terrorist who attempted to destroy their legacy, which led the two to reluctantly aid S.H.I.E.L.D. Sebastian himself was actually selected to join the original Avengers Initiative, though that plan was scrapped and Seb kept it from Tony.

When the world was threatened with an alien planetary invasion, Sebastian joined the new Avengers and helped defeat the Chitauri and Loki, culminating in the Battle of New York which saw Tony suffer from post-traumatic stress disorder, leading to the creation of the Iron Legion. During the HYDRA Uprising, Seb was one of the few people entrusted by Captain America to help bring down the corrupted S.H.I.E.L.D. In the ensuing War on HYDRA, when the Avengers were remobilized, Seb fought side-by-side with his brother in taking the fight to the remaining HYDRA strongholds on Earth. When the threat was eliminated, Sebastian soon learned of the Ultron peacekeeping A.I. being worked on by Tony and Bruce Banner, and successfully convinced the two to stop the project for fear of it going rogue. However, Tony secretly reactivated it, and though believing it would help the Avengers bring peace, it decided to instead try to extinguish humanity. The threat was defeated, but not without heavy civilian casualties. After the Ultron Offensive, Seb took Tony’s role in active duty, who retired in guilt after causing so much destruction.

When the Sokovia Accords were presented to Seb, he rejected them outright, a stark contrast to Tony, who supported it wholeheartedly as a way to keep the team in check. This led to a massive disagreement when it was presented to the full Avengers team. When the Avengers Civil War was ignited, Sebastian joined Rogers in helping track down Helmut Zemo. Seb stayed behind during the battle at the airport to buy time for Captain America and the Winter Soldier to escape in the Quinjet, but was the only one left behind to escape arrest thanks to his suit and quick-thinking. While Tony confronted Rogers and Barnes in Russia, Sebastian was able to break out Ant-Man, Hawkeye, Falcon and Scarlet Witch from their confinement. With Falcon and Scarlet Witch, Seb met up with Rogers, Barnes and Natasha Romanoff and headed to Wakanda, where King T’Challa agreed to shelter them from the United Nations, who had labeled them war criminals.

During his time as a fugitive, Sebastian helped Rogers and Romanoff in taking down terrorists utilizing Chitari technology while remaining off the grid, all the while developing a relationship with Wanda Maximoff.