Zach Sherwin (AKA MC Mr. Napkins) is a YouTuber who has appeared in three ERBs to date. He has also helped write the ERBs with Nice Peter and Lloyd Ahlquist after the episode he first appeared in, including Doc Brown vs Doctor Who and Sherlock Holmes vs Batman.
- Every battle he's been in features some kind of doctor (a normal doctor or professor doctor)
- All of Napkin's main opponents were played by Nice Peter, or at least partly: Stephen Hawking, Doctor Who and Batman.
- Napkins has also portrayed only intelligent people so far (Einstein, Doc Brown, and Sherlock Holmes).
- Holmes is Napkins' first character that did not have wild hair, and is also his first character that he didn't need a wig for.
- He has had the most guest appearances out of all other guests.
- Each of his characters have had different accents. Einstein had a German accent, Brown had an American accent, and Holmes had a British accent.