OOC : They can have a main element and by products of other elements. As long as one element is more prominent and the second is not as strong or is possibly related to the main element (Fire + wind to make fire tornados, water + fire for heated water breath, etc.)
I personally do like the idea of the Kuros being able to have two elements like that, wether they’re Skylander lore based, LoS lore based, or Original. Of course no dragon can master all elements except for the purple dragons (lore of this would of course change if original and not linked to spyro lore at all), but I think the two element thing could be a possibility. Probably not super common and again with one element being dominant over the other.
Weirdlanders 