By Adam Bloodworth Bradley Riches talks trolls, gory roles and being engaged at 22 as he prepares to return to the London stage in new musical Babies “I want to kill some people, that would be really fun,” says Bradley Riches, wearing a bright smile. “I want togo for the most kills in season three. I wanna go evil and I wanna kill everyone. I’m joking!” It’s not quite what you’d expect to hear from the butter-wouldn’t-melt Gen Z star who’s an integral part of Netflix’s Heartstopper as student James McEwan. When he isn’t redefining what queer representation might look like in the biggest LGBTQ …