If you want a serious watch cat they need to be all there. People think I’m kidding until they come here, and I have to lock my little tomcat in the back before they can come in. He will tolerate my grandson, but that is it. He sleeps on my legs, meets me at the door, understands “no” and “move”, no problems at all, with me. He puffs up about twice normal size, and all anyone sees is a mouth full of teeth. I’ve got to outlive the little fool, no one else would put up with him.
Sounds like a wonderful friend :-)
I had a powerfully-built part-Manx once who would regularly beat up local neighborhood dogs, and another that would run up and jump into my arms when I came home from work. Cats can be wonderful friends and ferocious allies.