When the Afropunk Festival débuted, in 2005, it was intended as a safe haven for black punks. As its popularity grew, so, too, did its embrace of the broader culture, and the marginalized soon found their space invaded by the mainstream. Nonetheless, the festival remains renowned for both its striking lineups and the equally remarkable fashion of its attendees. Included on this year’s staggering bill, running Aug. 24-25 in Brooklyn’s Commodore Barry Park, is Rico Nasty, whose raging punk-rap embodies the event’s original counterculture spirit.