depends on what his personality is. she could always use more friends. or a sibling. an ex of some kind, perhaps post her divorce and before she had her kid. or even someone from high school whom she's run back into. neighbors. a coworker or someone she knows from college. a rival (friendly or otherwise) pvper in one of the various video games she streams. or just a fellow nerd in general who wants to be part of her dnd crew. lots of possibilities.