The position of Brick in Borderlands 1 is tank. The Salvador in Borderlands 2 is not only a tank, but also has great damage. They could even shoot while they are reviving team members.
The berserker in Borderlands Online is a master to control their body and suppress their pain. They will outburst their stamina potential in the battle and kill opponents with fierce melee skills. They could ruin the opponents' formation and unleash ultimate skills. The berserker usually play the role of tank and traibreaker in a team.