You'd think that after yesterday, I wouldn't really have a least favorite monster. That's almost correct.
I had said in a couple places that any monster could be reskinned as a human of some kind, but that I still did not like to use humans as monsters for the party to encounter.
So, I thought about it and tried my hand at shemping a couple monsters that are traditionally the most hated D&D monsters ever. These are stated for Swords & Wizardry. Feel free to use them, they are licensed under the OGL.
F.H. Plum, the Priest
No one knows where he is from. Many who have asked ended up under his thrall for a few hours until they came to their senses 300 miles away from where they started. Little is known or understood about this peculiar man. Many choose to leave him alone to his wanderings.
Mr. Plum is dressed in shining white plate armor, though he never covers his face with his helmet. He carries a shining white spiked mace and a dirty gray bag of various odds and ends. He is not aggressive unless attacked. Even if attacked, he first attempt to deliver a foul spittle on his opponents. Anyone that fails their saving throw will be unable to be within 300 feet of F.H. Plum for 24 hours. If the spittle doesn't succeed, he will use his mace. Anyone hit by the mace will take and additional 1d4 points of acid damage for two rounds after the successful attack.
Violence, however, is rarely neccessary. Anyone that attempts to communicate with Plum must make a saving throw or be his thrall for 2d6 hours. Otherwise, he speaks only in total gibberish. Any attempt to use ESP or Comprehend Languages will fail.
Whatever his purposes are, he appears to be mostly harmless and best left alone. He does appear to walk, but observant creatures will note that he actually walks about 3 inches about the surface. It is rumored that he can walk on any surface, an ability that he sadly does not imbue upon his thralls.
F.H. Plum, the Priest: HD 2; AC 0 ; Atk Acid Mace (1d8 + 1d4 acid); Save 16; Move 6; AL L; CL/XP 5/240; Special: Repugnant Spittle, Charming Gibberish, Levitation
Udyn spends her time living near a large lake, just outside the village where she was born. She lives in a small hut near the edge of the water. She has domesticated a large number of ducks, geese and chickens and makes a living from selling their eggs in town.
She is otherwise ordinary in appearance and usually enjoys being hospitable to anyone that visits. Anyone who visits usually marvels at her ability to feed any number of people that arrive at her door. It is said that she once fed a local nobleman's garrison.
However, if anyone threatens her fowl, she will go into a rage. Anyone who fails their saving throw will be stunned for one round. The saving throw will need to be re-rolled every round in which she is enraged. She has no ability to fight in combat.
Udyn Nubuck: HD 1d4 hp; AC 9 ; Atk none; Save 20; Move 6, Swim 12; AL L; CL/XP A/5; Special: Stun, Create Food and Water
On second thought, shemping a creature originally described by Pliny the Elder as hurling almost half a mile of flaming poop with the properties of greek fire could be pretty bad. If I ever played Battlesystem again, I would make a rule for this guy.
Your charge against the left flank is not effective as you were hit with Greek Fire. Well, it's not exactly Greek Fire, it came from one man. He didn't have a traditional launching system for it, either.
You get the idea. Even terrible monsters, especially those that are not interesting in combat, can be made interesting by shemping. I could see adding Udyn as a major NPC that the party visits quite a bit. I mean, who doesn't like free food, right? F.H. Plum strikes me as either a survivor of swimming in the phlogiston for a century, or a cursed priest of a forgotten god. Breaking the curse could be a pretty good story arc with the right players. I'd love to see how they would "manage" his whereabouts.
Having said all that, I guess there are some monsters that I don't like. For some reason, I'm not a fan of unicorns. I also don't like autognomes though I do like having androids and robots in my games. It's just that the autognome is a poor robot and only funny for exactly one-half of a round. Beats me why I don't like them. I mean, I like the giant space hamsters and the miniaturized giant space hamsters. Why those two gnome gags always makes me chuckle is a mystery to me, too.
When in doubt, shemp a poor monster as a human to see if it can become more interesting. If it can't, the monster may not be worth your time.
P.S. While working on this post, I discovered that a perfect anagram of tirapheg is graphite. I almost created a human named Graphite, the Illusionist. As I was working on it, though, Graphite began to become more and more like Simon and the Land of the Chalk Drawings.