[b]Name:[/b] James Buchanan Barnes 
[b]Alias:[/b] Captain America, The Winter Soldier, Bucky
[b]Age:[/b] Technically somewhere in his 90s, maybe even 100s. But psychically speaking, he's around 28 or something.
[b]Gender:[/b] Male

[b]Affiliations:[/b] 
Steve Rogers AKA Captain America (best friend)
Sam Wilson AKA The Falcon (Other best friend)
Natalia Romanov AKA Black Widow (Friend, Love interest)
The Avengers (Teammates)

[b]Personality:[/b] James was standoffish to idea of training a bunch of kids. First off, he's not overly fond of kids. Second, he suffers from near crippling guilt over his actions in the past. However, Steve Rodgers and the rest of the Avengers (and SHIELD) had enough faith in the new Captain America, and encouraged him. So, begrudgingly, he agreed. 

James holds most people at arms length, refusing to let himself get close. The few exceptions being the Avengers, who helped him through his rehab and whom he eventually fought beside. He's coarse, stoic, bullheaded, and maybe a little unsociable, but at the same time, he's patient and compassionate. He often means well, but he isn't sure how to interact with people anymore. It's clear that he's not too enthusiastic about being there, and the only reason he stays is because he's seeking some kind of redemption for the whole "Winter Soldier" thing.
However, after a few weeks at the base, (in between missions and mayhem), James finally starts to find that the kids are growing on him. He begins smiling more often, laughing at their jokes, and just finds himself in a better mood. One has to wonder, who's teaching who?

[b]Abilities:[/b] (copy and pasted from the wiki page)

Having trained under Steve Rogers (the original Captain America in World War II) and others in the time leading up to World War II, "Bucky" Barnes is a master of hand-to-hand combat and martial arts, as well as being skilled in the use of military weapons such as firearms and grenades. He also used throwing knives on occasion and was a gifted advance scout. His time as the covert Soviet agent known as the Winter Soldier helped to further hone his skills, making him the equal to his predecessor in combat skills and an expert assassin and spy. He is also fluent in many languages, including English, Spanish, Portuguese, German, Russian, Latin, and Japanese. He can understand French.

Winter Soldier's left arm is a cybernetic prosthetic with superhuman strength and enhanced reaction time. The arm can function when not in contact with Barnes and can discharge bolts of electrical energy from its palm. The arm can discharge an EMP causing electronics to either shutdown or become useless. The use of Barnes' EMP is shown when Barnes uses it to shutdown a Nick Fury LMD and when he attempts to use it on Iron Man. The arm has a holographic function to disguise it as a flesh and blood arm.

As Captain America, he possesses the original, indestructible, vibranium alloy shield used by his predecessor, as well as a Kevlar/Nomex blend, shock-absorbing costume. He often carries several conventional weapons such as knives, guns - mostly a Colt 1911-A1 .45 and a P08 Luger - and grenades.

[b]Other:[/b] Bucky isn't carrying Steve's shield anymore. When he came to the Titans, he insisted that Steve take it back so that he could fight with the Avengers. Besides, Bucky's always been more of a gun guy anyway.

He was recruited to help teach the Titans fighting and weapon skills. SHIELD was very avid about him doing this, mostly because they wanted someone they knew and trusted behinds the scenes of this new team to keep tabs.

[b]Appearance:[/b]
Out of costume:
[hider=Bucky Barnes]
[img]http://i562.photobucket.com/albums/ss64/FiestaSiesta/bucky_zps0cd541b6.png[/img][/hider]

In costume:
[hider=The New Captain America]
[img]http://media-cache-ec0.pinimg.com/236x/62/c9/94/62c99401aa44dd58241e3d15f5dacc8a.jpg[/img][/hider]

[b]History:[/b]

James lost his father early on in WW2. He was sort of adopted by the soldiers at Camp Lehigh as a mascot. There, at the age of 16, he was specially trained to be Steve Roger's sidekick. He fought alongside Captain America for a few years. All was fine and dandy until a mission went south. Captain American and Bucky found themselves of an experimental drone plane, armed with a bomb. The bomb exploded while they were trying to disarm it, sending Captain America into the North Atlantic to be deep frozen, and Bucky to god knows where. 

Everyone presumed him dead when Captain America was found and unthawed. Little did they know that the Soviets had found Bucky first. He was revived, all memory of his past lost, and given a new arm. They 'reprogrammed' him to be their own personal Cold War assassin, the Winter Soldier. He was incredibly successful as he traveled all across the globe, committing assassinations and then disappearing like a ghost. However, because of his reprogrammed memories, he was unstable. To keep him from rebelling. The Soviets kept him in cryo freeze. This allowed him to live on for 70 years, while only aging a few. 

It was 70 years later, after Captain America was thawed and brought back into action, that Bucky was discovered. While sent to assassinate the patriotic hero, Steve recognized his old best friend. SHIELD was eventually able to save him, bring back his old memories, and give him work to keep him busy. However, his identity had to be kept secret. The Winter Soldier's death was faked, so that no one would try to hunt him down. After Steve's supposed death after the events of the 'Civil War' , Bucky was talked into becoming Captain America. Only a select few SHIELD agents, and Avengers, know the true identity of this new Captain America, and if anyone else found out, they could all be in danger. 

He's been Captain America few a couple years now.