Magneto (real name: Magnus Erikson) is a powerful mutant and villain from the Marvel series, X-Men. He is the archenemy of the X-Men, as an anti-villain on many occasions. Despite once being close friends with Professor Xavier, the two became enemies when Xavier championed the co-existence of mutant and human kind working together. To Magneto, a Holocaust survivor who had seen and felt first-hand the worst ways human beings could treat those they deemed different, such a system was impossible and he instead championed a violent and destructive pro-mutant stance, one which saw humans as the enemy in a genetic war and promoted the idea that mutants should become the dominant species on Earth.
In addition to his traditional role as the adversary of the X-Men, Magneto has fought against several other heroes and villains in the Marvel universe, and also fought with both the X-Men and other heroes on numerous occasions, even becoming the leader of the X-Men for an extended period of time, all to achieve his goal of protecting mutantkind.
He is the father of the Scarlet Witch and Quicksilver, both of whom were originally part of his terrorist organization known as the Brotherhood of Evil Mutants (later referred to simply as the Brotherhood, as Magneto became a more morally "grey" character). It is later discovered that he has another daughter with his powers; Lorna Dane, also known as Polaris.
Though Magneto is a villain against the X-Men group, he has since in the comics joined them a lot of times, even becoming a hero himself, though he is not a supervillain due to his morals - he is an Anti-Hero because he protects mutants from humans at any cost. Several times, he could be compared to civil-rights leader Malcolm X.
He can be seen entering a portal to the Oasis along with Ultron.