Imagine if you were like a koala and ate only one kind of food. what kind the fool would it be?

If I lived near an area with eucalyptus, that is what I would like to give him. Other than that, I know koalas are kind of healthy and they eat plants (and if given to) veggies. So I would probably try to keep them on a sort of human diet type of thing.

Eucalyptus leaves. Koalas usually eat eucalyptus leaves or other leaves of trees native to Australia.