Ok, I know the area, I'm a UC grad.Duke This has been going on for about 6 months. I don't recall anything that would have caused these. No one else has experienced this everyone I tell calls me crazy. The house was built in 2003. There has been one other person besides myself and my family that has lived here it is a "Victoria Mello, 43" she is still alive. My house is in the Suburban area of Cincinnati OH, by Montfort Heights South. I have experienced a few things prior to this I have heard like noises and things but I didn't think to much of it. Paranormal activities wise no I have not however I have played a lot of that new Phasmophobia game but I don't know if that really counts
It's interesting you initially indicated you thought you were being haunted by a child, apparently because the footsteps you heard on your roof reminded you of a child running. Then you mentioned seeing a 4-6 feet shadowy figure, which doesn't sound childlike. Sounds like you believe you are dealing with two different entities.
The shadowy figure sounds like an entity known as a shadow person. Like most areas of the paranormal, there are more opinions than hard facts about shadow people. The good news is I've never heard of a shadow person harming anyone, although they can be frightening.
Author/podcaster Heidi Hollis is probably the best source of information on the subject. If you look around on line I'm sure you can find articles she's written and/or podcasts she's done that could give a better idea of what you might be encountering.
Others here are better qualified to discuss how you might wish to proceed, but the basics are in the link I previously provided