Erik Lensherr (Earth-106)

"I now see that mutants AND humans have a chance. But to further this possibility, I'd like to become an Avenger."

-Magneto

Earth-106
On Earth-106, normal history proceeds as on Earth-616, up until the time Magneto fought the Avengers. After the battle, he realized that the Professor was right, and he gave himself up. However, he asked that he serve his sentence on the Avengers. He was allowed this oppurtunity, and proved to be a great Avenger. He began advocating mutant rights while serving his tenure with the Avengers. After it was over, he stayed anyways.