I met a guy who wanted to be my sugar daddy and we started talking. He’s sweet and we have actual conversations but he wants to make me a member of “staff” in his company and wants my information. I declined to do so and we still talk but then he mentioned it again and I am starting to think he might be a scammer.
It is a scam. The story is an attempt to get information that can be used to steal money or to launder money, or both.
Even if they are not lying, and they are trying to add you to the company payroll, that brings up other troubling problems. There are tax issues for the pay you would be receiving. There could be issues if the company isn't 100% owned by them, they could get fired for fraud, and the company would be looking to get the money back.
There is no way this ends well.
It is 100% a scam. There is clear language that makes it seem so. Not only does he want to make you a member of his "staff" (using), he also wants your information. That is an immediate red flag and it's good that you caught on, and the issues presented by @mhoran_psprep that could turn up are exactly the consequences you should look out for. It's always good to be wary if someone asks for personal information.