Scary cat

My mom and I are welcoming stray cats until they're ready to be adopted, and we have a cat who is our kitty cat (he's way to cute btw.) We jst started, and we used to have a black and white cat who ran away, so we welcomed another cat, who's huge and all black. He's really pretty, but kinda scary. But the first cat (who ran away) came back, so we have 2 stressed cats in our place, and the huge black cat stays in my room, but every time I walk in, he looks at me with scary eyes. So last night, i slept on the couch, i was to scared.