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.
I like the cosmic-Marvel cast around Warlock and the infinity watch and then later on the guardians of the galaxy, except the guardians are probably considered A-listers now due to the movies, those groups have a bit of a 'DnD in space' vibe to them, Warlock + Thanos relationship is also interesting sometimes, btw whenever I see Spider Woman (Jessica Drew) show up in stories she seems cool and doesn't have as much of an inflated ego as the rest of the big names, I should look into the modern runs by Hopeless and Pacheco
I got the D&D vibes from black knight in the avengers too.