So far, Nighthawk has had a real estate developer pushing gentrification and cops profiling young black people. I can't remember the last time a mainstream superhero comic tackled institutional racism this directly. It's kind of breathtaking.
Moon Knight, Night Thrasher, the Black Fox... Marvel has a few characters that incorporate elements from DC Comics' Dark Knight. But the House of Ideas' most on-the-nose nocturnal-avenger homage is probably Nighthawk, a character who originated as part of Marvel's Squadron Supreme concept.