Besides the fact that it's either not known to exist in the lore or genetically possible (in reality), I think it's important to ask a couple questions about this kind of idea.
Mainly, is this something that really helps the character or is it something that just sounds cool? How will this play out in actual role-play? I doubt many people would go around saying, "Hello, I'm John. By the way, did you know I was a half-breed? I know, pretty cool, right?" Well, maybe John would if he though it would help him pick up women... but anyway.
Since you can't actually make a character that looks half and half, people will assume you are X race most of the time. Which means, if this is something that is important to the character, you'll have to explain it, which, to me, if you have to explain a physical feature as a defining aspect of the character, then it's going to cause some awkward moments in role-play.
My point is, unless there is a personality reason for it, ideas like this can be awkward in actual role-play if it's the cornerstone of your whole character concept. IE, don't let this kind of concept replace your development of their personality. Leaning on a concept like this can make a character seem very one-dimensional.
Mainly, is this something that really helps the character or is it something that just sounds cool? How will this play out in actual role-play? I doubt many people would go around saying, "Hello, I'm John. By the way, did you know I was a half-breed? I know, pretty cool, right?" Well, maybe John would if he though it would help him pick up women... but anyway.
Since you can't actually make a character that looks half and half, people will assume you are X race most of the time. Which means, if this is something that is important to the character, you'll have to explain it, which, to me, if you have to explain a physical feature as a defining aspect of the character, then it's going to cause some awkward moments in role-play.
My point is, unless there is a personality reason for it, ideas like this can be awkward in actual role-play if it's the cornerstone of your whole character concept. IE, don't let this kind of concept replace your development of their personality. Leaning on a concept like this can make a character seem very one-dimensional.
