Beast Boy (Garfield Mark "Gar" Logan)

In the published DC Comics continuity cited, Garfield Logan contracted a lethal illness called Sakutia in childhood. To save him, his father used an untested scientific serum to change him temporarily into a green monkey—an animal immune to the virus—so the illness could run its course. The serum had the unintended effect of permanently turning his skin, eyes, and hair green and granting him the ability to transform into any animal of his choice; animal forms also display his green pigmentation. This origin is presented as a scientific/medical accident within the fiction; variations exist across different comic runs, but the supplied sources attribute his powers to that experimental procedure.

As a baseline human, Garfield permanently displays lime/green pigmentation of skin, eyes, and hair resulting from the experimental serum. In costumed service he has worn uniforms that include a purple cowl during his tenure with the Doom Patrol and later appeared in Teen Titans costumes; he later used the alias Changeling after a storyline in which the name "Beast Boy" was mocked. When he shapeshifts, he becomes the chosen animal form, and those forms retain his distinctive green coloring. The sources do not provide an exhaustive catalog of animal forms.

Beast Boy is described as a shapeshifter who possesses the ability to transform into any animal he chooses. His powers are framed in-universe as the consequence of the experimental serum administered to treat Sakutia, making his abilities scientific in origin within the fiction. Narratively he is often used for comic relief through joking and wisecracking, a persona that masks recurrent emotional trauma related to parental deaths, betrayals, and the loss of teammates; he forms close bonds with fellow heroes (notably Cyborg) and treats superhero teams as found family. The supplied sources do not enumerate additional superhuman effects beyond animal transformation and the pigmentation trait that carries into forms.