Under 'my settings' then 'personal info' add an optional personality type area of the form. People could input their personality type info, including personality color (blue, green, red or yellow, based on Meyers-Briggs, DiSC or other).
Then have a subtle way to show the personality color; such as when hovering the mouse over someone's name, have a color dot next to it or their name underlined in that color. Subtle enough to not be distracting, or seem empty if you did not want to have personality type, but visible enough for those that did.
See WorkFront Personality type article for additional insight on personality types:
https://www.workfront.com/blog/personality-typing-benefits
