full blooded Japanese here. raised in the states, but I can speak Japanese fluently.
when I went to live in Japan for a year, a myriad of people brought up that I look like a "half" and mentioned how beautiful they look. and by that, I mean a fuckton of them. I talked to a lot of cute women at my part-time job, I even got phone numbers for the first fucking time in my life. but due to my hikki nature and lack of social skills I was never able to man up and proceed any further beyond friends.
so yeah, simply being a half-breed won't be enough. you have to back it up with personality. be it humor, charisma, intelligence, a hobby that entices them, something that catches their attention other than your looks.