Assuming that genetics work the same way in Eorzea Hydaelyn as they do IRL, two different races do can have an offspring. It's when two different species mate that offsprings are either impossible, or sterile (see the cases of Hinny and Mule).
To be an interesting, intriguing, well-written character, there needs to be something to allow the audience to relate to them. That is what the problem is with who wants their character to be "perfect". Perfect characters will never be strong, and strong characters will never be perfect, because WE (those who read, who watch, who RP) are not perfect.
"What makes a strong character is how they deal with their flaws, their fears, their turmoils, their troubles that get in the way. That's what makes them relatable." -- N.C.
"What makes a strong character is how they deal with their flaws, their fears, their turmoils, their troubles that get in the way. That's what makes them relatable." -- N.C.