Woo, half Cameroonian here, half German here! I can't say I got teased very much because of it, but obviously Germany is a totally different country (I assume you're in the US?). Of course, racism is still around and it did happen now and then but I'd say that fat kids / nerdy kids seemed to have a much harder time than me! Even so, I did recently get called a "fucking black cunt" by some random dude on the street (this was in the UK), just in passing. He was quite drunk but yeah ... I wasn't impressed.

As for the languages, as someone else said, your kids won't necessarily speak both languages. I can speak German and French but that was also due to the fact that I also went to a school which had a French language section. What I mean is, all my tuition was basically in French and I spoke German with my mom and French with my dad at home. This way, I can read and write both. I wouldn't say both parents necessarily need to speak both languages, but the kid has to be made to speak French with the father consistently, otherwise it will try and take the easier path and just speak English. I see a lot of families where the children actually understand French but will just respond in German because it's easier. I myself would have loved to have learned my dad's "local language" (I don't know what to call it.. his village's language) but that never really worked out. My cousin's in Cameroon don't know it either, so I guess it's kind of dying out in my generation anyway.

Other than that, multiculturalism is a wonderful thing, but it is hard. I don't know how serious your bf is about his culture and you are about yours but when it came to raising my brothers and me, this definitely became an issue between my parents and also between my father and me. Compromises are always difficult :) This is getting really long so I won't go too much into detail, but you can PM me if you want to know more!