As far as other cats go The Beast for all his general gitness is a bit of a wuss.
He did used to have a friend cat opposite us. A rather gay looking ginger cat we named Stanford (Sex and the City reference, the OH's idea not mine

)
They used to run about together and Stanford would sometimes come through the flap and eat his food, no real bother.
But generally he seems to either annoy, or not get on with other cats, and comes off second best.
Many is the time he has battered through the flap to safety, and come home with bite marks, wanting a hug.
We had a spell where another, bigger, black cat, which we named 'gangster cat' (we are a bit sad, and give random cats names

) would hassle the Beast, and he would hide in the bush out front, and a few times the OH would go out and shoo the cat away.
I blame the OH, she molly coddles him, when I try to discuss with the Beast his wussness, and that he needs to buck his ideas up, I'm told I'm being horrible