Shark : fish :: koala : bear
At least I think it is because a shark is a fish so I guess a koala is to bear.
I hope I helped :)
Explanation:
Decide to make his followers laugh
People flock him to listen to his jokes and return home laughing. The Monk will make fun of himself. He make sure that there, in the crowd, were not a single gloomy face.
His last wish is to be cremated under a tree
in his compound