Ok yeah, that right there is my prob: human/fiendish half-dragon...mixed with a vampire. This is the stuff i was talking about, now half-elves, half-orcs and the standard like. When I think of halfbreeds, I think more of the biological ability to mate. yes, divine beings can, and in legends, have been animals and mated with mortals, but I think that stuffs stupid. And yes, a dragon could polymorph into aperson and mate with them, but personally, I wonder "why would it care, or want to? Why would it even thing people were attacted, or anything of the like" I know its fantasy, and you can do what ever, you can always say well ITS MAGIC..but I think thats just easy, and a bit munchie.
And about the whole centaur, I never put them into my groups, or anything like that. Only lycanthropes, and thats rare, but I use it as a desease. And when orc's mate with people, its rape, so most women of the middle ages, if they bore such a crature, I assumed would kill it, or perhaps the male of the house would kill them both.
Now this all stems to the poing: are the other races closest to Humans, the same, or are they really different races. If they are tottally diferent races, then they cant mate, but if they are similar, but only different offshoots from one another down the evolutionary trail, then I'd say it be ok, and only in the particular races that would find one another attractive. And to me, thatd be Elves and humans, and orcs, but only by the way I've stated. Yes, a woman could mate with a Dwarf...but what twisting background would you have to make so that these two got together, and would it be excepted...would the parents think or care about how their child would be intergrated into their people.
My thing is, I dont think DM's or Players think to deeply into this, they just want to throw things together and see what new things they could do.
Some one said "just cause you could do it, doesn't mean it should be done." I agree, and was just wondering how far you, the DM's would allow your players to go, and if your a player, how far your DM's let you go.