Corki is amazing for farming as well. The little bonus true damage on his auto-attacks makes last-hitting a breeze in mid. Corki is squishy however, you need to try to save your W for emergencies to get away. Kiting is very important if you are getting chased. W in a way where they have to walk through the fire. Continually shoot your ult back, while still moving forward. By the time they realize they are low, you should be able to W back in and Q for an easy kill.