Pete in the Torgue DLC. Also for Hyperius, Bee and a Sandhawk, or if you are Zero invest into Bore.
(Flying: throwing yourself at the ground and missing)
As mentioned, Pete is the easiest. There’s lots of good tips in this thread:
There’s also some Hyperius and Gee hints and tips in both the BL2: Gameplay DIscussion and the individual character categories, so you might want to check out whichever is appropriate for your character.