Thread:Shabook/@comment-24800939-20200126204444/@comment-112155-20200126210427

Agent Planck is, together with Agent Copernicus, Agent Newton and Agent Kepler, part of a set of characters named after famous physicists, namely Max Planck, Nicolaus Copernicus, Isaac Newton and Johannes Kepler.

Perhaps that should be added to the article's trivia section.

As for the Father Eisner, he is the deuteragonist of a story starring his adoptive daughter. I think that makes him unique enough too.