A dancer could be a great support class, a buff and debuff catapult of swinging hips , legs and arms.
AoE sleep -> for a short time only
Singel polka kick -> interrupts
break dance -> mute (why on earth could a break dance mute...)
classic dance -> enemy gets more damage
headbang -> enemy gets a accuracy debuff
Sure, a lot work to get it sorted. But i would love to find another game with a real support class. Such a class which LotrO had with the lore master in its early times. Migthy debuffs but low damage. (you could potenially debuff a mob into oblivion...)