Team Colors
BattleArena comes pre-installed with a team colors module which colors a player's username based on their team color, and gives them a prefix with their team name.
Configuring the Module
This module can be enabled by adding team-colors to the modules section of your Arena Configuration. No other configuration is required from this point, and once BattleArena has been reloaded with /battlearena reload, the module will be activated in the arena.
However, if prefixes are not desired and only coloring the player name based on the team color is desired, the prefixes feature can be disabled by adding team-prefixes{enabled=false} to your arena options.