User blog comment:Alk'r Guardian/Which Borderlands Character Do You Play?/@comment-8235119-20130715194636/@comment-1438327-20130715200530

Gaige summons a robot, Deathtrap, that works similar to Axton's turret(s), only without long distance reach. DT will aggro for you, and will fly towards the enemy for melee hits. As he upgrades, he will get a laser, an explosive clap, a flurry of melee hits, elemental capabilities, and other upgrades that make him better at a distance.

Krieg's special is Buzz Axe Rampage, which makes him go into a melee only mode where he takes out his buzz axe and uses it to maul enemies. Whenever you get a kill in Buzz Axe Rampage, your health goes back to full. His upgrades make his Axe explode when thrown, and give it a fire element. His most prominent upgrade, Release the Beast, makes it so that when one activates Buzz Axe Rampage at 33% Health or less (When the triangle with the ! comes up), he turns into a Badass Psycho, making him stronger with his axe, and having the cooldown on the weapon reset when the skill runs out. Other upgrades let him spew fire, take more damage, do more melee damage, and let him run around throwing dynamite during Fight For Your Life.