I like the image of an insidious tequila worm that is up to no good. I picture him with a tiny sombrero on his wormy head.
The sole objection: Donovan, being a competent wizard using suggestion magicks should have found it quite easy to go all Jedi on the investors. "You WANT to revise the contract. The original Timmy is FAR better. No one will LOVE you unless you abandon this folly."
It does not feel like revenge - after all, the girl did nothing to actually wrong Sean the Failure.
Also, this kind of petty envious hatred is so common that likewise the Skrelleth demons would inadvertently be an everyday problem.
Also, the >curse< thing is unfitting for such petty critters - I see them rather physically switching bottles, spilling poison ivy extracts into a bath, or carrying a diseased cloth to their victim.
Actually, we had a 30 with this theme....
Only, it got to 101.
What about simply adding these to that list? (Also, some of these are duplicate of problems on Scras' list).
Minor issue: legionnaire's disease is caused by a bacterium, not fungus.
With the right kind of players, this can be an interesting plot hook.
Though, the mechanism of wish-granting could be subtler in some instances - at time it reads like a marketplace ("What does a leg get me?"); also, I can envision it sticking longer to one wishing person who has a great dream, helping him but consuming him in the end.
Plot hooks are good.
All in all, a good sub.
Rather than painting a picture, it throws up questions.
As for their dimensions, they'd have to be disproportionately thicker than a simply enlarged human, as strength of bone increases with its cross-sectional area, but the burden placed upon it with the volume of flesh. Hence, why elephants are so stocky.
While quite single-minded, with a sole purpose, sole course and thus sole dimension, this is a very tragic character - and may even be suitable as a protagonist if one adds a desire to combat the madness and goals beside killing.
What you might add are details of his schemes, how he goes about his quest for vengeance, for personally hunting a cult spread amongst the stars is stylish, but ineffective.