expand_less Wim is the color of willpower and metal.  It represents the totality of your desires and urges, as well as the discipline to see them through.  Motivation, courage, and determination can be powerful forces in the right hands, and together they can help stave off temptation.
With Dau, Wim represents the fighter, guardian, soldier, and warrior.  But also the threat of attack and the courage to rise to the occasion.  Fear is the dominant emotion of these colors.
With Yun, Wim controls the axis of power and aspects of the physical form or body.  Many extraordinary abilities are based in these colors, as Wim asserts itself as the source of all power and Yun emerges as the effect of that power.
With Pfi, Wim assumes the aspects of war and peace.  Where discipline and morale might fail, a brilliant strategy can succeed.
Sace and Vei are the colors most indifferent to Wim.  Magic subverts power and the natural laws upon which it depends.  A man can use willpower to resist its effects, but ultimately he is powerless to control magic unless he also possesses the wisdom or charisma to properly manage the emotions of himself and others.
A grizzled veteran or mercenary might be a prime example of a Wim-based character.  Forged by battle, they possess the courage to laugh in the face of death (Dau) and a plan to survive the encounter (Pfi).  Perhaps their body is weakening or they simply lack a land of their own (Yun).  In any case, they'll either attain power, peace, or fall to those who want it more.
Real life is filled with historic individuals that showed grit and determination in overcoming adversity.  Usually their cause is promoted more than their personal motivation, but occasionally heroic moments stand out.  Perhaps Audie Murphy is a good example here - a war hero that displayed uncommon valor and courage.  He later struggled with physical ailments and emotional issues, showing classic conflicts.
Wim maps most closely to the classic color Magenta:
Hex: FF00FFRGB: (255, 0, 255)HSV: (300, 100, 100)
Other associations:

Bones
Mountains
Serenity
AutumnMonsoon orseason fall(in in six-season calendarscalendars)