I am unsure if it can be fitted into any expansion but here goes.
I was thinking about a FUN class to play and how could you use such a class in guild wars.Here is what i come up with
Jester
skills could include
Jack in the box:-
trigger a Jack in the box at targets foes location all foes near this location are knocked down.
Well of the insane
Create a well at target corpse anyone who enters the well will be spun around 180 degrees.
Trickery
The next hex targeted at target ally is re-directed to nearest foe.
Ball bearings
you run 25% faster whilst dropping ball bearings any foes chasing will be knocked down for XX seconds.
The Big joke
you tell a the big joke all foes near this location cannot use chants or shouts
juggle
throw 3 juggling clubs at target foe for each one that hits target foe suffers from weakness for XX seconds.
Hypnotism
hypnotise target foe and for XX seconds target foe cannot attack or cast spells.
As i say you could mess about with it.Make it a fun class create fun skills that help control the enemy rebound,spells,hexes,attacks cause some chaos on the battlefield.The armour could be very colourful one handed and 2 handed weapons.great head gear
anyway try not to beat me to hard for the suggestion