What guy? The "mysterious veggieperson"? That's Onion man! Did you just not meet him?
then i guess i didn't get everything
Edit: oh i guess i should tell you my progress, i have the Misfortune symbol, the Lord of Misfortune (i forgot his name) and the old stompo chief, im also maybe missing the one entry in the picturebook that just plays the honk sound but im not too sure there's actually anything related to that entry (my best guess if there is is the 100% screen)
Edit 2; I've done it