Fulton

Fulton is one of Roofus' sons who can be found in World Quack Centre.

How to Rescue in Fur Fighters
After taking the normal elevator, General Bristol will point to him on the other tower. To get him, push the buttons in the center of the area back and forth. Eventually, Fulton will hop over and wait for his father near the telescope.

How to Rescue in Fur Fighters: Viggo's Revenge
Opposite the security room is a door leading outside. Hidden next to a tree is a mound which Roofus can dig through. After digging through a couple more mounds he will reach Fulton.

Trivia

 * When gliding down the other tower to the spot where Fulton was in the original game, there is no collision on the ground.
 * For whatever reason, his location is swapped with Angus in Fur Fighters: Viggo's Revenge.