The stereotype of all enchanters being manipulative and stealers of willpower are by and large a subsect of enchanters. Where most enchanters will only use their power to overcome problems the puppeteers are notorious for stealing their victims will with little compunction.  

Their strength is also their weakness, most if not all puppeteers have a well grounded fear that they too might actually be under someone else's control

Eyes of the master

Beginning when you select this school at 2nd level, you can spend a full round action to see through any target you have charmed or dominated. 

While this ability is active you can't see through your own eyes and are effectively blind

Life long friends

Beginning at 2nd level, whenever you cast a charm spell, the spell last One additional hour per wizard level.

This ability can only be used once per long rest

Reconditioning

Starting at 6th level, any target you have charmed or dominated suffers disadvantage on futher charm and dominate by the puppeteer 

Dominion

Beginning at 10th level, you can target one additional creature per point of Int+1 when you cast dominate.

Only simple commands can be issued to more than one target (stay, guard, attack)

This power can only be used once per day

Thrall

Starting at 14th level,  you can choose to make one target of your dominate permanent. 

The choice must be made before the target makes their save. The target must also be a lower CR than 1/4 the wizards level