The Mechromancer is Borderlands 2's latest creation, and as such everybody has to have it. Although the character was made public long ago, much mystery has surrounded her skillset. Until yesterday, that is, when her skill tree was made public. We wasted no time in devising the best builds for the character. 

Although Gaige is primarily a "pet" class thanks to her ability to summon the Deathtrap robot, she can be surprisingly good at drawing aggro and tanking. Her Deathtrap minion makes her all the more effective when it comes to drawing attention away from your teammates, and staying alive once you have all of the enemies focused on you. If you'd like to tank with the Mechromancer, use the following build:

• Close Enough (3/5)
• Cooking Up Trouble (2/5)
• Fancy Mathematics (2/5)
• The Better Half (3/5)
• More Pep (3/5)
• Myelin (2/5)
• Shock Storm (4/5)
• Smaller, Lighter, Faster
• Anarchy
• Pre-Shrunk Cyberpunk
• Typecast Iconoclast
• Rational Anarchist
• Death From Above (4/5)
• The Nth Degree
• With Claws

This bulid eschews any focus on Deathtrap to instead increase the power and versatility of your guns. Your bullets will richochet off of walls and even off of enemies themselves, giving them increased chance to strike. Whenever your bullets hit the head, they'll emit a powerful electrical shock. Finally, the Ordered Chaos tree will give you the Anarchy ability, which will make your bullets much more deadly before eventually culminating in a super-powerful melee move.

If you'd rather focus more on Deathtrap than your guns, use the following build:

• Close Enough (4/5)
• Cooking Up Trouble (1/5)
• Fancy Mathematics (2/5)
• Buck Up
• The Better Half (2/5)
• Upshot Robot
• Potent As A Pony
• Explosive Clap
• Made of Sterner Stuff
• 20% Cooler
• Sharing Is Caring
• More Pep (3/5)
• Myelin (2/5)
• The Stare
• Strength of Five Gorillas (3/5)
• Shock Storm (2/5)
• Electrical Burn (2/5)
• Shock And AAAGGGGGHHHHHH
• Evil Enchantress (2/5)
• One Two Boom

This build spreads a nice array of abilities between you and Deathtrap, but still focuses primarily on staying alive via stronger shields and health while dealing elemental and melee damage to your enemies. 

If you want to go with a jack of all trades build, use the following build:

• Cooking Up Trouble 
• Buck Up
• The Better Half (4/5)
• Upshot Robot
• Potent As A Pony (2/5)
• Unstoppable Force (2/5)
• More Pep
• The Stare
• Shock Storm (4/5)
• Electrical Burn (2/5)
• Evil Enchantress (2/5)
• Shock And AAAGGGGHHHHH
• Anarchy
• Smaller, Lighter, Faster
• Preshrunk Cyberpunk (4/5)
• Robot Rampage
• Annoyed Android (2/5)
• Typecast Iconoclast (3/5)

This build will give you the basics of each ability, without delving into the depths of each tree. You'll be able to use each of Deathtrap's essential abilities and dole out some elemental damage, but your overall build will lack any one specific focus.