Bio and Personality
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.
In Huffin and Puffin, Hans claims to have kissed Skipper's sister. When Skipper says he has no sister, Hans exclaims "Then who did I kiss?" Whoever he kissed didn't have a beak, so its very possible that Hans kissed Marlene, who was walking with Skipper right before Hans first appeared.
He also appears in The Hoboken Surprise. At first, he appears so happy that he had given up on his grudge against Skipper and the penguins. This Hans was later revealed to be an android duplicate, as the real one had been imprisoned by Frances Alberta, along with all of the other animals at the zoo. The real one escaped along with the other animals and helps battle the android duplicates.
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.
In Skipper Makes Perfect, Hans is seen in two different flashbacks, but had no lines.
Its possible that Hans might have a bit of a crush on Skipper (Though it could be interpreted either way). In Best Foes, Hans seems thrilled to be Skipper's best friend, mentioning that he has secret dreams about them being "BFF chumsy-fumsies." Throughout the rest of the episode he refers to him as "budsy-wudsy", "palsy-walsy", and "Skipsy."
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. This may be possible because Hans had his wings clipped in his early life. It is not explained why he cannot fly.