Hey look! Michael Rooker's Yondu has his own Guardians of the Galaxy poster! Director James Gunn released it on Twitter earlier with the following caption:

"Yondu poster yo."

This character is basically a space pirate in the Marvel universe, and he's the one the took Peter Quill off of Earth after Quill goes through a tragedy when he was a little kid. As you can see he's holding the same space artifact Star-Lord has been seen with in almost all of the trailers. 

When talking about the character, in a previous interview, Rooker said he has "some interesting issues — not a good guy, not a bad guy. There's hope and there's a heart inside… It's not so black and white — I should say blue and white. And I enjoy roles that are like that, even if they're not in some galaxy somewhere other than ours."