Alright, I've honestly been wanting to see a thief type class in GW but after thinking it over a thief doesn't really have any place in the game; however, that led me to the Acrobat.
Basicly the Acrobat would charge into battle confounding the enemy as much as possible with skills centering around interrupting, bleeding, and crippling all the while dealing a kind of support damage. The main use in a nutshell would be to completely distract the enemy with the Acrobat, all the while the Acrobat is flipping and dodging the enemy's attacks and giving them fairly good damage and great status damage.
The four attributes would be.
Lance Mastery: Yeah the Paragon have spears, but the lance would be used as a polearm, giving a sort of reach aspect and aiding in starting aerial manuevers. The lance would be used for mainly status damage such as interrupting, bleeding, etc.
Single Dagger: Since the Acrobat is an entertainer by day and a thief by night a single dagger would come in handy in story aspect, now in character use it'd be the main damage dealer. You could tie in sneak aspects to this as well.
Acrobatics: Obviously it would HAVE to have this attribute, basicly it'd be the dodging aspect; getting in and out and back into combat quickly would be handled by skills from this attribute.
Death Defiance: This would be the primary skill, increasing it would add a chance to dodge attacks.
Now for armour, they'd obviously wear light armour so they'd have to rely on their quickness, fleet of foot, etc. to stay alive.
S
