If the King once had a fling with the Ice Queen…that could have made Elsa, thus making her still the rightful heir to the throne as well as a half sister to Anna! It’d explain Elsa’s blonde hair, paler skin tone, as well as the ice powers.
[adrotate group="5"]
"If you go as far as you can see...you will then see enough to go even further." - Finn Balor