Arkham Knight

"You always told me, Bruce... focus on what I want to achieve, and it'll happen. Well, want to know what I want now, huh? I want you dead."

- Arkham Knight Chosen by Batman to be the second Robin following the departure of Dick Grayson, Jason Todd differed from his predecessor and mentor in his attitude towards crime. Angered at Batman's refusal to kill his nemesis the Joker, Todd tracked down the Joker and attempted to bring him down. However, the Joker defeated and captured Todd, torturing and seemingly murdering him in a tape sent to Batman. In reality, the Joker faked Todd's death and continued torturing him both mentally and physically in an effort to turn him against Batman.

Eventually escaping (or being set free), Jason ended up in Venezuela, where he founded and trained a mercenary army with state-of-the-art tech and weapons, alongside donning his own version of Batman's armor before deeming himself "The Arkham Knight". He then took to monitoring Batman and his allies after the Arkham City incident, before allying himself with Scarecrow and his plot to infect Gotham with fear toxin.

On the night of the actual attack, the Knight's mercenaries quickly brought Gotham to it's knees, with the Knight growing increasingly impatient with Scarecrow and demanding to kill Batman. Eventually, Todd's anger gets the better of him and he attempted to kill Batman in a tank battle, with his failure leading to the destruction of the Cloudburst, a weapon crucial to Scarecrow's plan. After fleeing for some time, the Knight ambushed Batman in the subterranean area of Gotham with a giant drill, and managed to destroy the Batmobile after a brief chase.

As Batman attempted to free Commissioner Gordon from the Scarecrow, the Knight cornered him and revealed his identity. Batman's shock angered him further, and Jason attempted to kill Batman once again. After his final defeat, Jason fled, initially broken, though he ultimately switched sides and rescued Batman from Scarecrow's clutches. Abandoning the persona of the Knight and instead becoming the Red Hood, Jason swore to protect the people of Gotham from crime, but in a much more ruthless fashion.

Battle vs. Winter Soldier (MCU) (by BeastMan14)
TBW.

Expert's Opinion
TBD.