I had a friend who had a cat named Trouble he was black. sounds just like hers she decided she wanted a cat so she went out to her FIL dairy barn and capture one of the youngest kittens . Boy I still have scars from that day. Most of them were freals and of course people wuld drop off cats all the time(farm way out of town) He did become a great lovy cat but did it take lots of patience and time.
On the lite side maybe he needs some of the found cats canadian catnip to mellow him out.