My main user page is in Russian Wikipedia so far...

Unlike typical heroes, it is Ivan’s simplicity and lack of guile that turn out to help him in his adventures. For example, he listens to his heart, rather than his mind, he easily forgets offence and endeavours to help others even at his own expense. His naivety, kindness and daring help him fight villains, make friends, win princesses' hearts and ultimately he is rewarded with half a kingdom or some similar accomplishment.  
Ivan the Fool