Mine has to go to my guy Vision. I just recently got into comic books (early last year) and I really enjoyed from the 80's the limited series of him (?)(it?) and Scarlet Witch. And just recently Roger Stern's Avengers where Vision tries to play god link his brain up with all the computers in the world and nearly dies to bring about a misguided utopia.

I think what I like about him is that he's a robot but he's very human and loves Wanda a lot and it doesn't feel phony or forced. Contrast that to Mockingbird and Hawkeye and it's just kind of like meh.

Plus he's got rad powers too. He should join the pantheon and bad ass robots like Android 16, 17, 18, The Terminator, Johnny 5, and HAL 9000.