One possible option, though not the most serious one, for replacing Andrew Jackson (as well as a crosshatching exercise). Pigeon was a character I drew for a brief story long ago and she’s haunted my sketchbooks ever since; just a well-meaning Luftmensch with her own style.
The “your doctor” line was repeated many times by one of my high-school science teachers. No one ever thought it was funny.
(set installation from the Mad Men exhibit at Museum of the Moving Image)