This Flarum extension adds color circles around avatars based on their group
To install the latest version compatible with your forum:
composer require clarkwinkelmann/flarum-ext-circle-groups
This extension is under active maintenance.
Bugfixes and compatibility updates will be published for free as time allows.
You can contact me to sponsor additional features.
Support is offered on a "best effort" basis through the Flarum community thread.