<Beast Boy>
He's the comic clasic "clown" of the group. Allways jocking and making pranks to his companions. Has the unusual ability to transform in any animal he wanst -even dinosaurs- this power and his green skin were product of a sickness he had when he was little. (According with the old comic book)
<Raven>
She's the mysterious character of the group. Remains -the most times- isolated from the recreatives activities of her companions immersed in meditation or reading.
Her powers are driven by emotions, they force her to stay unexpressive and without feeling anything. With her mind she can move objects (Telequinesis), Melt them, Read minds (Telepathy) and has visions of the future.
<Terra>
There's not much about her. She traveled for all the world (Well, I don't know if all the World, but was in many palces), searching one place where she can fit in.
She lose control over her powers and that makes her run from city to city. In one of those 'runs' she met the Teen Titans and stayed with them for a while, until she thought that Beast Boy betrayed her telling Robin her -no so- secret. Running away again, she finds a mentor in Slade, who used her to defeat the Titans.
At the end Terra regrets her desicion of Betraying her friend and end attacking Slade. But things didn't end well, her uncontrolled powers created a Volcano and, protecting her friends, she stopped it sacrificing herself.
^ Triangle??
First of all I'm a "Beast Boy and Raven Fan" I really think that they do a cute couple and deserve to be Together.
And Terra? Well, in my opinion she is some kind of "Link" between them. Before her Betrayal she was Rave's friend and dated BB once. Her disloyalty caused more pain in these two characters than in any other Titan.
Raven trusted her and thought of her like a real friend, something usually hard to ear in the dark Titan. And Beast Boy found someone who laughed at his bad jokes, shared things with him and needed his protection.
If Terra had not "Died" at the end of the 2° Season, maybe this "Triangle" must be more interesting. I think that there were jealousy behind the intense battles between Raven and Terra and not just the pain of the Betrayal.
^ Beast Boy was the Best friend that Terra has.
^ Terra was the first person in gain Raven's trust so easy.
^ Raven and Beast Boy share a strange but strong friendship, with all their differences and Small arguments.
I See a Triangle There ^ ^