Have you watched Guardians of the Galaxy Vol. 3? If your answer is no, then what are you waiting for? Hurry up to see this masterpiece by James Gunn! Nebula is the blue-skinned alien portrayed by Karen Gillan, which you see in our fanart Marvel Nebula cursor. Firstly, she was introduced as a villain, annoying and desiring to kill her sister Gamora. But when she finally found her real family - Guardians of the Galaxy - she became one of your family. Raised as the adoptive daughter of Thanos and the adoptive sister of Gamora, she grew to share a bitter rivalry, eventually making her way to becoming a welcoming member of the Avengers and then officially of the Guardians of the Galaxy.