Amethyst and Martinex
 
Martinex is another character that I would love to see show up an a Guardians of the Galaxy sequel. I just always thought that he looked really cool, and I imagine he would look even cooler in live action.  When folks asked for more Amethyst team ups, he was the first character I thought of.

http://braveandboldlost.blogspot.com/2015/08/martinex-is-another-character-that-i.html