Hacker - The hacker is essentialy the same as the Mechromancer in the way that they both use a robot as their action skill. This is no ordinary robot though, it is the Mini M.I.N.A.C. This robot can be equipped with turrets, rocket launchers, and a lazer eye.
Bionic Friendship Tree: focuses on upgrading your Mini M.I.N.A.C. unit.
Titanic Tree: upgrades the antimatter element and gun abilities.
Dead Tech. Tree: ups sheild recharge and Fight-for-your-life time.