As a few people have guessed, or may already possibly know, Winnie The Pooh Characters are all based on mental disorders that many children have. Let me explain:
Winnie The Pooh: Eating Disorder.
This may explain his constant desire for his favorite food, honey, and his life seems to revolve around his eating problem.
Tigger: ADHD
This is a disorder of the brain that causes you to be over active and unable to focus on just one thing at one time, this is why he bounces everywhere and cannot think about the situation he is in instead of worrying about something that is totally off subject.
Rabbit: OCD
OCD is where your brain mentally organizes things and you feel uncomfortable aroud a messy area, or around not well organized people. Rabbit is constantly trying to clean up Tigger's messes as well as his own.
Piglet: Panophobia
The condition where you fear everything, he twitches and he gets overly nervous about everything he does. This may explain why he has anxiety attacks.
Euyore: Depression and Self Harm
Ok I think we all knew this one. Depression is when your filled with a gloomy feeling, or being emotionally numb causing you to have a negative outlook on everything, and self harm is when you feel the need to take a razor blade, scissors, or any other sharp object to your skin to feel better.
Owl: Narcissism Personality Disorder
Owl thinks hes the 'smartest' animal in the woods and he thinks too great about himself. He believes everything should go his way because he himself is too good for everything else.
Christopher Robin: Schizophrenia
The disorder when your brain hallucinates and you can hear, see, feel, or smell things that arent really there. He imagines his stuffed animals and toys are really alive, and they talk to him, and go on adventures with him.