feminist sirius black lecturing random people in the corridors about patriarchy and how girls are under represented in history books

LGBT+ activist remus lupin, usually shy when talking in front of people, explaining for an entire hour to the entire common room how important pronouns are

anti racist activist james potter calmly exposing what cultural appropriation is to a bunch of unaware white first years

ecologist peter pettigrew talking with dumbledore himself about the consequences of magic on environment