Hans

Hans apparently knew Skipper in the past because he is "sorry about Denmark". An incident in Copenhagen allowed Hans to frame Skipper for an unspecified crime (probably involving explosions), making Skipper Denmark's public enemy number one. After Skipper left, the Danes caught on to him, and ousted Hans from the place. Hans went to the zoo to try and get a new base of operations whilst pretending to want to be friends with Skipper, but was defeated by him and was sent to the Hoboken Zoo.

He is seen in The Return of the Revenge of Dr. Blowhole, escaped the Hoboken Zoo after the events of The Hoboken Surprise and he is now working with Blowhole against the penguins. Although he may have been attacked by Blowhole's Mind Jacker, what had happened to him is unclear.However,he reappeared in Action Reaction that means he may have escaped the mind jacker or accidentally hit by something that made him remember again.

He is currently living back in Hoboken with Mama Possum taking care of him

Hans is incredibly skilled in hand to hand combat and is highly agile, enough to take on Skipper, on a equal level, and possibly even defeat him. In terms of personality,

Hans is very deceptive, intelligent and enigmatic. In the series, Hans cannot fly.

In reality, Puffins are capable of flight.