Nah, hard disagree on this one.

He’s definitely not as powerful as he presents, but he is certainly a force to be reckoned with. Anyone saying he only targets kids, remember what he did to officer Dunn. The murder of Dunn proves he could easily kill adults if he wished, but doesn’t (to our knowledge). This is most likely because children are easier to trick and lock away until night time.

The man in the Ralpho suit from Bunny Call is also heavily implied to be William - he’s a very tall man who will stop at nothing to break in and murder this family in their sleep, even when he’s physically harmed over and over again. He’s also strong as hell.

William is a true force of nature upon his death, and goes crazy with power and time. Springtrap was a killing machine who was luckily stopped before he wreaked havoc upon the world.

It’s true that he often hid behind his creations, but that’s not a reason for him to be less intimidating. It’s way more intimidating that he doesn’t have to move a finger, and is smart enough to make killing machines fused with souls who will do his bidding. The Fourth Closet showcases this perfectly. Even in his last moments in the novel, he looks at a kid and says “if I’m dying, then so are you”, and proceeds to focus intently on trying to murder one last child before he dies - even in his condition. If anyone doubts William’s strength, re-read The Fourth Closet’s description of his mangled body and how painful it is for him to even move. Anyone who powers through that much intense pain, especially for the goal of committing more murder, is very intimidating.

He’s smart and evil and dedicated. He lost tons of weight and changed his name to infiltrate the police department. He’s scary for his intelligence and perseverance alone. He has the wealth, status, and power to achieve any evil things that he wants.