Bringing back the duck
Some of the oldest comic book characters are pretty obscure, so much so that you might never even have heard of them. You can often spot nods to them in Marvel films. One of the coolest things about the Marvel Cinematic Universe is the character of the Collector and his treasure trove of interesting items and creatures.
If you pay close attention to Guardians of the Galaxy 2, where we get a good look around the Collector’s collection, you’ll meet Howard the Duck, voiced by Buffy alumni Seth Green. He’s the titular character from an earlier comic and a movie adaption in the 1980s.