The Third

The Riddle legacy seemed to be sons who went against their father's wishes. Tom Riddle the First was manipulated into eloping with Merope. Tom Marvolo Riddle broke away from his Muggle roots. Even with all that history, it was a surprise when Tom Riddle the Third appeared during the war with a radical thought- he wanted to be good. OC, Strong!Harry, starts at book 5ish