I know this has been suggested so many times, so let's cut right to it: Shamlet Mask should be added to the game for our monster/merm friends.
"But Starboy," you may be asking, "there shouldn't be items that completely remove a character's downside!"
To that, I answer that those items already exist in the game. Specifically:
Wolfgang has the Belt of Hunger, which completely removes his """"""downside"""""".
Wickerbottom has the Tam o' Shanter.
WX has the Eyebrella.
Please consider it Klei.
also Steamed Ham Sandwich would be a fantastic addition as well