What kind of narrator is Candide and can he be trusted?

Candide is young and naive, making him the definition of
the unreliable narrator.  The reader cannot trust the unreliable narrator to convey
correct information because the narrator himself does not fully understand what is
happening.  Candide is overly optimistic, making trusting his judgment a problem. 
People take advantage of him because he is hapless and foolish, and though he is
fundamentally a good person he seems to have no control over what happens to him.  Chaos
follows him, and he cannot be considered a reliable narrator because he is still trying
to figure out life, and what is happening to him.