Pfftchh

Pfftchh is a monster

who tells funny jokes

The punchline of which

He'll never let you know.

He'll laugh behind your back,

But whatever he'll do,

He won't let you know

if he's really laughing at you.

Lolhopper

Lolhoppers are happy creatures

who are not haughty, or proud

but who fell an overwhelming urge,

at everything to Laugh out Loud.

They'll laugh at the good, the bad, and the ugly

the happy, the sad, and the dull.

They' pull elaborate pranks

and claim they did it for the Lulz.

Lateus Animalus

The Lateus Animalus is a "Mirth" Demon. Like many other demons he feeds from the lifeforce of his victims, in this case the energy released during laughter. Mirth demons are generally harmless, but will pull elaborate, cruel, and sometimes dangerous pranks in order to feed.