Is there an "evil prankster" type monster?

[Yqatuba]

It seems to me there HAS to be a fey like this.

[MrCharisma]

Yeah I was gonna say just pick any fey ... or GREMLINS

[Temperans]

There are evil tanuki. Ash Giants aren't "evil" by default, but they do have a morbid sense of humor. Festering Spirits tend to pull a few pranks.

Honestly, you can even do templates to convert some creature to evil.

[Coidzor]

I'd swear there's some kind of evil Jester fey or the like which may fit the bill. Evil individuals of certain interpretations of Gnomes would also work, I suppose, unless you're really married to using Golarion Gnomes only. D&D-style Nilbogs would also work in and of themselves, but don't mix super-well with Golarion Goblins.

Pranking is more a matter of actions and attitude, though, rather than raw monster abilities.

[VoodistMonk]

Leprechauns... with Sylvan Trickster UnRogue levels... using Sap Master... it's all fun and games until someone gets tagged with pop-pop's nickel sock...

[Scavion]

Pugwampis...Give it class levels. Watch your party hate it with every fiber of their being.

[VoodistMonk]

Scavion wrote:

Pugwampis...Give it class levels. Watch your party hate it with every fiber of their being.

Indeed...

I like focusing on save or suck spells in particular... although the only way to guarantee decent DC's is to go with a Wisdom-based class or archetype. Dirty Tricks are good, too. Anything that imposes negative conditions is standard. Traps can really shine inside their Unluck Aura, as well.

I like to pair Pugwampi with a handful of Pygmy Gnolls and an equal number of Rageborn Gnolls... if I am feeling squirrelly, maybe even a Giant Demon Gnoll Antipaladin, or two...