There was so much going on that fans missed about Raven and Beast Boy.
Raven is the love interest of Beast Boy from the Teen Titans series. She is the daughter of Trigon. She grew up in an alternate dimension called Azarath.
BB B Beastie Boo (by Mother Mae-Eye and Raven's Passionate Emoticlone) Little Green One (by The Brain) Green Machine Beast Man; Beast Dude