I know its a boring answer but it would depend on how the character looks and plays. I main Sektor now and had Ermac as my main previously. Neither of them have ever been my favorite character. I picked Ermac because he was easy to pick up and later picked Sektor because I really liked his play style. My favorite MK character in general is Quan-Chi but I don't like how he plays in MK9 at all for some reason. So I ditched him.