iOS - Colored Profile Halos

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Blue - Fitocracy Heroes. They're premium users that get extra benefits like private messaging, Duels, and a weekly insights report (you can look into it here - https://www.fitocracy.com/become-a-hero/)

Orange - Team Fitness Coaches. They run Fitocracy's online training programs. You can see them by tapping on 'Hire a Trainer' in the top left navigation (aka the 'burger' menu).

Purple - Fitocracy Staff. These folks work at Fitocracy. They're usually quite helpful and (mostly) harmless, unless you poke them with a stick, feed them after midnight, or steal their lunch. Then, well... it's best not to find out.