When Rift Herald is a major bro

{quoted}

bro brō/Submit nouninformal 1. short for brother. "his baby bro" 2. NORTH AMERICAN a male friend (often used as a form of address). "they'd never choose a girl over their bros"

you just assumed it's gender

Well, it is actually confirmed that Rift Herald is female. I just use the term "bro" to refer to someone who's a good friend, male or female.