As the youngest child in the Bat Family, Roy Wayne was determined from childhood to get out among the people and develop in every way.
He learned sweet-talking and flirting from his big brother and dad, proper Crime Alley swear words and how to change a tire from his second brother, how to stay up all night tailing people and arranging home deliveries from his third brother, and lockpicking and how to swipe things from others from Catwoman, his dad's on-again, off-again love interest... When it came to building up his skills, he was fiercely independent.
Having inherited the best traits of Gotham's heroes and villains, Roy Wayne assumed that, barring any surprises, he'd follow family tradition on his eleventh birthday, kick out the previous Robin, Damian Wayne, and become Gotham's new Robin. But then an owl delivered an acceptance letter from England, across the ocean.
Curious about formal magical education and his mother's past, of which he remembered nothing, Roy decided to cross the ocean and join this full-time magical boarding school.
How will a child trained by Batman fare in the unfamiliar world of British magic?
Please note: The heroine's romance will be complicated, with a love triangle. Her values are similar to Jason's, her approach to love resembles Batman's and the eldest brother's, and her maturity is on a level with Tim and Damian. Family > self > friends/lovers. She believes that her own feelings matter most.
She'll kill Voldemort and the Joker. The villains won't be friendly. No Hogwarts house will be demonized. Comments showing house bias will be deleted. The canon characters will be written more realistically, rather than as part of a simple “happy story.”