expand_less Biz is the color of fortune, wealth, and luck.  It's the accumulated karmic value of your actions and the material value that flows from that.  High Biz individuals seize opportunities, making the most of their lucky breaks while surviving the worst star-crossed days.
With Ela, Biz serves as the liquidity of water or the harshness of winter.  It also describes creatures that dwell in those habitats, such as swimming creatures.
With Dau, Biz represents fate, destiny, survival, and nature.  Natural selection and survival of the fittest are the hallmarks of these colors.
With Yun, Biz includes workers, traders, laborers, and merchants.  Those whose physical efforts and personal wealth are intertwined stem from these colors.
Glei and Quae are the colors with the least overlap with Biz.  Chance and skill have always been somewhat at odds, and the high minded aspirations of those colors often conflict with the immediate needs of Biz.
A rich merchant might be a good example of a Biz centered character.  She thrives by capitalizing on opportunities by facilitating the flow of goods and services.  Especially in this pseudo-medieval fantasy world, goods produced in lands of abundance (Yun) often travel over the sea (Ela), threatened by brigands or bandits that take what they want by force (Dau).
Frane Selak might be a real-world example of a Biz centered character.  He survived his first brush with death by swimming from a train wreck through an icy river.  He then went on to survive several other freakish accidents by sheer luck.  Later in life he bought a lottery ticket and managed to win a million dollars.  Many of his worst encounters were against fire or required clutch strength to pull through.
Biz maps most closely to the classic color Spring Green or Turquoise:
Hex: 00FF80RGB: (0, 255, 128)HSV: (150, 100, 100)
Other associations:

Randomness
Greed / Jealousy / Envy
Flow (as an abstract concept)
Money / Cash