I decided to convey platonicism as a grandient to the center, as that represents the varying degrees of closeness.
Homoplatonic – Tendency of wanting friends that are the same/similar gender. Teal is a relaxing colour, and that symbolizes the sameness of the two genders.
Heteroplatonic – Tendency of wanting friends that are of a different gender. This one’s just a hue shift. I have yet to find a different colour for this one.
Bi/panplatonic – Both combined. (Keep reading for extras)