A study of these myths and legends, give us the picture that these half-dragons actually tended to look quite human, and not inherit any visual aspects of their dragon parent. This article concentrates on people in mythology who were the result of a human-dragon coupling human half-dragons. “Dragonkin” designates creatures that are partially descended from dragons (which could include half-dragons).
“Half-dragon” designates a creature with one dragon parent and one non-dragon parent (which may be a human). Modern tabletop roleplaying games and fantasy has given us two useful words “half-dragon” and “dragonkin”. These progenies were generally more special than your average human.
In fact, in the realm of mythology and legend, dragons have mated with humans, and produced offspring from these unions. The above quote is from a book about writing fantasy literature. – The Complete Guide™ To Writing Fantasy: Volume One~Alchemy With Words “What if a dragon (gods-forbid!) mated with a human? If there is a way, either magically or physically, you could have this happen, what would be the result?”