Jonathan

Jonathan is one of Roofus' sons. He can be found in Lower East Quack. He is first seen on the train which whizzes past you as you enter the level.

How to Rescue
There are two ways to rescue him. One is to leap on the subway train as it passes and avoid getting thrown off. Jump down when you see Carlos and walk up the ramp. At the very top, the train will be stationary, and Jonathan will wait for you inside. The other is to wait until later, and enter Upper East Quack from nearer the exit.