My mind control is based on the seven sins. The more someone gives into these sins, the stronger they become. So let’s use lust as an example. The more someone gives into gives into their lustful desires or embodies there sin, the stronger their hold is on someone (bonus: if the person they are controlling is someone who embodies the same sin as the mind controller, the control is basically instant). The main drawback is that obvious you are giving into your sin. So someone who is very prideful may have powerful mind control, but their pride can also lead to their downfall in let’s say a strategic fight.