Geddoe is really probably White and Red, when you get down to it. While he's not much for law and order, he's definitely got a strong personal sense of morals and buys into the idea the protecting the weak idea. On the other hand, freedom is probably one of the single most important things to him ever: the biggest reason he dislikes the rune is because it giving him immortality effectively traps him in life without giving him any choice in the matter. That and while it's rarely aroused he does have a temper. And, y'know, True Lightning Rune.

Sion is White for obvious reasons of desiring order and peace and all, and Blue because he's intelligent, cunning, and a skilled liar and manipulator. Also, while it rarely shows, he has a deep streak of Black in him; I could cite various things for this from issues from traumatic childhood/life to occasionally having to make less than savory decisions as king, but really what it comes down to is that you just can't go and make a deal with a demon to obtain the powers of a god of destruction in order to take over the kingdom without having some black in you okay, no matter HOW relatively pure your motives are. >_>

...seriously though Sion is just... ahaha yeah COMPLICATED in canon, so.