Winnie the Pooh | Fan Theories Wiki | Fandom

https://fantheories.fandom.com/wiki/Winnie_the_Pooh

https://goat.com.au/entertainment/the-mind-blowing-theory-that-winnie-the-pooh-characters-represent-mental-health-conditions/

https://pooh.fandom.com/wiki/The_Disorders_of_Characters_in_Winnie_the_Pooh

I have a different take, which is that each character represents different emotions, possibly related to Christopher Robin.

Tigger:  Exuberance

Piglet:  Fear

Owl:  Pride.

Eeyore:  Sadness.

Pooh:  Happiness or hope.  Friendship.

Kanga:  Caring or empathy.

Roo:  Joy.