KogaFriend is a badge given to players with good behavior. Acquiring this badge isn't a common event, and is based on a criteria from admins.
Criteria
“A KoGaFriend is a nominated KoGaMa user who has helped Multiverse through things like community building, events, contests, bug tracking, or other positive influences”.
A small Multiverse committee will consider the nominations from the community and recommendations from the developers' team. Every person awarded a KoGaFriend badge will be called out as to why they have been selected.