|Krieg is the second DLC character added to Borderlands 2, joining Gaige the Mechromancer.
So who is Krieg? Well, he's a slightly less insane psycho, grasping onto bits of his humanity to leave the wasteland life and become a vault hunter.
Unfortunately, due to technical limitations Gearbox won't be able to add audio logs for Krieg like with the original four classes, so apart from some upcoming promotional material, there's never really a chance to learn more about the character. At the very least, his insanity is well reflected in how he plays.
Buzz Axe Rampage is Krieg's action skill. When activated, he makes a blood curdling scream, and runs around chopping people down with his buzz axe which regenerate his health. You'll have to time yourself carefully when using it, as it's Krieg's only way to regain health. All of Krieg's skill trees are seemingly counter-intuitive, but have a light-at-the-end-of-the-tunnel feel to them.