in some ways he HAS to be very similar to me. personality wise it would be the absolute best for me. but when it comes to relationship behavior, no.
i have noticed that i tend to like happy go lucky guys even if i resent their ignorance is bliss attitude. i am a serious person who can be very humorless about some things, but when i am social i like things to be cheerful and upbeat. so i cant date a guy who broods.
the other thing that sticks out to me is i like to have my way. so he cant be like that. i date have a future for someone who would press for his needs over mine, i need someone who is going to give in.
those things apart ideally i would prefer a partner who is similar to me in habits, interests, perspective, and functioning. i would not want a partner who is dissimilar to me AT ALL. i dont believe opposites attract.