I'd like a man of justice. 35-40 years old. A "human" version of Ryu, but less serious and monotonous. Someone capable of becoming the main non-ninja "male" character, like Jin Kazama in Tekken. Someone working for the CIA or something. He doesn't have to be manly. He could also be a Shaolin monk or a adventurer.
Problem is that Bayman already fills that role because of his missions. But Bayman should find another goal in DOA6. He deserves better than being Helena's lapdog. The man needs to take his revenge... I mean, after 5 installments, I cannot wait to see the climax!
Bayman would be "The Man Who is Seeking Revenge", while the new male character would be "The Man of Justice". That would be the difference. One is "controlled" by his emotions (anger), the other just follow his values and has a real sense of morality.
Regarding his personality, I'd like him to have more derision than most male characters (the opposite of Leon). Not a clown like Zack (sorry), but rather Nathan Drake's relaxed attitude.
I'm curious about this new character in Spring. Is it someone they have designed for Vanilla but that they could not put in? Is it a totally new design? Shouldn't they keep him (or her) for DOA6?
For me, Libra in Fire Emblem really represents that emotion of "calm strenght".