Recovers HP overtime after being inspirited by an enemy.
"Furgus" combines the name "Fergus" and "fur".
Furgus is based on the youkai Keukegen (also his Japanese name), meaning "hairy, fluffy sight" or "strange and suspicious thing" depending on how it's written: a living mass of hair the size of a dog that will appear from beneath the floorboards when no one is around, and prefers dark, damp places. It is said that those who live in a house inhabited by a keukegen will suffer from weakness and poor health.
It's random nicknames are: Fuzzball, Blake, Robin, and Moptop.