In human form, Siku is short for a man with a rounded face, high cheekbones and almond-shaped golden-brown eyes. Short he may be but he's wiry and well muscled. There is a lot of power in him that many overlook because of his size.
In wolf form, he is as white as the ice for which he was named and larger than his human form would indicate. His eyes retain their golden-brown and have an eerie glow that he attributes to the influence of the moon on his people.