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As a child, Garfield Logan contracted with a rare illness called Sakutia and was cured by a serum from a green monkey. This serum had the unintended effect of turning his skin and hair green and gave him the ability to change into any form. 
Originally and currently known as Beast Boy, he was adopted by Elasti-Girl and Mento, members of the Doom Patrol. He later joined the West Coast team of the Teen Titans (known as Titans West), and was part of the New Teen Titans assembled by Raven. It was at this time that he took the name Changeling. He remained with various incarnations of the team, forming a close friendship with Cyborg.
He later began using the name Beast Boy again.  Following a failed attempt to recreate "Titans West" as "Titans L.A.," he rejoined the main team.
He has also worked as an actor, playing the role of an alien in the TV series Star Trek 2020.
Whatever team he is part of, he likes to joke around with people and make jokes of the situations the team get themselves into. However, this is only a facade. In reality, Beast Boy is a boy who has suffered many hardships in his life (both his real parents have passed away, and then his foster mother, whom Garfield became very close to, died in battle along with virtually all of the other Doom Patrol members. He was also part of the team. Also, his foster father was driven mad by a helmet he used to fight enemies). He also has lost many teammates and fell in love with Terra (a member of the Teen Titans) and was heartbroken to discover that she was a traitor working for Deathstroke and hated the Teen Titans with a passion. Even after her death, he refused to believe for a long time that she was a traitor and blamed Deathstroke for corrupting her and using her. As a result of all of this, he uses his jokes to cover the fact that he is scared of losing anyone else he is close to. Despite all of his hardships though, Garfield is friendly and upbeat.
In the "Titans of Tomorrow" adventure, wherein the Titans glimpsed a grim, possible future, Beast Boy had changed his name to Animal Man (II) and fought alongside his fellow, fascist Titans to make the United States a police state. This future Beast Boy is shown as feral shaggy, and more bestial in appearance. He is also characterized as still bearing a grudge against a possibly-resurrected Terra, who, in this future, is a member of the more benign rival group Titans East.One Year Later", they have apparently separated. After trying to hold together a ragtag band of Titans, once Robin returned Beast Boy left the team to rejoin the Doom Patrol and aid his adoptive parents. Following attacks on various former Titans, it was determined that the sons of Trigon were trying to destroy the group to establish a name for themselves. The Titans decided to reform to combat the threat. At the same time, Beast Boy tried to reconcile with Raven.
Average in his human form. Varies from animal to animal.
Flight as a bird, fast running as a cheetah
Beast Boy appears in the Teen Titans animated series, voiced by Greg Cipes. In the series, Beast Boy (nicknamed "BB", and others) plays the role of the lighthearted jokester of the group, though often the butt of many jokes himself (similar to his comics self). He wears his old black and purple Doom Patrol uniform, complete with gray gloves and purple sneakers with seemingly velcro straps. Like with the other Titans, his appearance is much younger than in the comics. Also like in the comics, Beast Boy has the ability to transform into any animal he sees. His favorite forms are a Pterodactyl (for flight and transporting his fellow Titans) and a Tyrannosaurus (for heavy-duty combat).
Beast Boy is generally portrayed as a carefree, scatter-brained and immature personality. He is prone to making jokes no one but himself (in particular, Raven) can laugh about, and generally displays few intellectual-based interests and little sense for tact (though on occasion, however, particularly in the fifth season, Beast Boy does show hidden intellectual and leadership qualities). His carefree behaviour is most likely conditioned by his resignation from the Doom Patrol, where Mento's harsh discipline and less than encouraging attitude had not allowed any free-wheeling. Beast Boy's closest friend among his teammates is Cyborg, with whom he shares a passion for video games and movies. Likewise they are prone to quarreling, especially about their diverging tastes in food; Beast Boy is a vegetarian who never gets tired about persuading his teammates into adopting his culinary tastes as well.
Like in the comics, Beast Boy also had a romantic relationship with Terra who had the power of Earth manipulation. As in the comic book, Terra betrays the Teen Titans as an ally of Slade (Deathstroke). Ultimately, she receives redemption in helping the Titans defeat Slade; however, she is turned to stone in the process. In a departure from the comic book, Beast Boy retains strong feelings for Terra. In the final episode "Things Change", Beast Boy encounters a girl looking like Terra (although it is unclear whether or not it was the real Terra, as he was the only Titan who saw her), apparently suffering from amnesia.
In the Season 3 episode "The Beast Within", Beast Boy is seen in a newly-gained "Super-Werewolf" form when he was doused with an experimental DNA compound. Beast Boy dislikes this form and refrains from using it again until he and the other Titans are fighting off Slade's fire-soldier army in "The End: Part 1" when they have to use their most powerful abilities to defeat them. He never uses it after then, suggesting that even with the strength and abilities it gave him, he considered it a "last resort" to be used.
Season 5 of Teen Titans focuses on Beast Boy a great deal, as it deals with his history as a member of the animated series' incarnation of the Doom Patrol. Until "Homecoming", in which his former teammates make a guest appearance, Beast Boy was the only member of the Doom Patrol to appear on the show. In the second episode of the fifth season, Beast Boy becomes the first male Titan in the series to be explicitly referred to by his real name (Garfield). In "Titans Together", Beast Boy leads Herald, Jericho, Pantha, and Más on an assault on the Brotherhood of Evil. He remains the leader even after other Titans such as Cyborg, Starfire, and Raven join the fight, and only stands down from leadership when Robin is thawed.
Teen Titans member
This character is or was primarily a member of the younger superhero team known as the Teen Titans, in any of its various incarnations. This template will categorize articles that include it into the "Teen Titans members" category.