The characters in Wind in the Willows reflect many characteristics of the animals in whose bodies they reside.
Badger is respected and feared because of his great strength, but he is also a wise, compassionate and caring friend of everyone but the weasels.
Mole is excitable, independent, and eager for new experiences and encounters. He throws himself wholeheartedly into every new adventure and is always ready to lend a helping hand to anyone in need.
Rat is compassionate and generous, although his concern with maintaining proper appearances means he isn't always as willing to immediately get involved in helping others when they are in trouble.
Toad is somewhat simple of mind but generous of character, particularly with those who are willing to act as an audience for his singing and descriptions of his great adventures. He's a bit conceited but tries to share his wealth and the pleasures it supports with his friends whenever possible.