One skill in the Best Friends Forever tree is "Close Enough;" it makes bullets that miss their targets ricochet off surrounding objects toward the intended enemy. "Can't aim? That's not a problem," Hemingway says.
Another skill tree may end up as the counterpoint to Best Friends Forever, offering a hardcore mode, and the third might be a "shock gameplay tree." Gearbox is still playing with the Mechromancer's tree, but "you'll definitely see a few things with the robot hand in her skill trees," Hemingway says.
The Mechromancer's main skill is to summon Deathtrap, a giant robot, and her tree will include skills that teach him new abilities. One new ability is called Explosive Clap, which has Deathtrap rush enemies and clap his hands together to knock them down.
Hemingway wouldn't give away the Mechromancer's name, and Gearbox is still working on her final build. The Mechromancer is planned to launch 60 days following Borderlands 2's launch on September 18, as paid DLC or free for those who pre-order the game.