Who is Meg's friend?

Calvin O'Keefe, one of the novel's main characters, travels with Meg and Charles Wallace through space and time to help rescue Meg's father. During the trip, Meg and Calvin grow very fond of each other and begin a courtship. Calvin, as a brother to eleven other siblings, struggles with issues of fitting into his own family. He laments that his family would not even care if he was missing, though he still loves them very much. He is also very different than his family, and exhibits genetic traits not shown in other members of a family. This, he says, makes it even harder for him to fit in. He exhibits a special talent, however, for persuading people towards particular points of view. This is a talent that comes in handy during the children's quest to find Meg and Charles Wallace's father.