Focus: if you invest in all four of the primary stats (strength, dexterity, technology, and support), you can receive a bonus for reaching tiers. For example, for reaching 25 of all four stats, you receive +1 bonus damage.
Primary: damage range for your primary weapon.
Sidearm: damage range for your sidearm.
Auxiliary: damage range for your auxiliary weapon.
Defense: the reduction range. "Reduces all physical damage inflicted from an enemy; increases with dexterity."
Resistance: "Reduces all energy damage inflicted from an enemy; increases with technology."
Next to your character's class, on the statistics page, you will see a prefix. This prefix is a title that is based on how many wins you have (1v1 and 2v2 combined; note that NPC fights count toward the number of wins).