I voted Michael. He is the deepest and the most tragical character. The other siblings are just side roles. Very well depicted, yes, but nothing comparable to Michael's gigantic personality who stands alone in the trilogy.

I got sympathetic feelings for Fredo, as well.

I don't want realism. I want magic! Yes, yes, magic. I try to give that to people. I do misrepresent things. I don't tell the truth. I tell what ought to be truth (Blanche/A streetcar named desire)