I think that Thieves could use Spears underwater then why not on dryland too? Crossbows would be a good idea for thieves, engineer, mesmers and rangers.
Knuckle type weapons for thieves
Thieves could use a chain type weapon, like a chain scythe or something like that.
Thieves could use chakrams.
Fan type weapon for casters.
Tomes..
Throwing Weapon specifically rather then justa throwing dagger.
What else?