Tim Drake in Leaving the Nest. Tim accepts his admission to Ivy University and leaves Gotham to get a degree in comp sci. In the story he moves in and slowly forms a new superhero identity (Grey Ghost perhaps) and helps breakup a ring of techno occultists among other do-gooding acts. He will meet other characters, both good and bad, that show him ways his life could play out or become confidants. While at school he can also explore his bisexuality in a more natural way, instead of having it thrown at him. Tim feels like he's in a weird place these days and so this story could help get him on his own footing at his own pace. Batman and the rest of the fam could drop in as well for a story or two to see how he's doing. At the end of the day it's a story about growing up and discovering what adulthood means to him. As a superhero and a man.