Not 'monumental' as in important, but as in pertaining to a monument.
First off, please note these pictures of Notre Dame's roof. Pretty, no?
Ok, so the anthropomorphic waterspouts are the gargoyles, the ones that aren't waterspouts are grotesques, but what about the saint statues? It strikes me that there simply must be a specific term for them, but nothing's leaping to mind (other than calling them 'effigies').