Ms Haniver plays Call of Duty - a FPS game - daily with her friends, as she has done for years - even though she is often subjected to harassment when men discover that she's a woman, as she told the BBC in 2012.
But, recently, Call of Duty introduced an option to play as a female character.
Now, she says "everyone I know when given the option will play as female characters" - including some men, who have also lobbied for more female characters and a reduction of both hypersexualised female and male characters.
"The more we're normalised and shown as protagonists, the more women are going to want to play games," she
says.