Will come and sit on your keyboard while you're trying to do stuff cos he thinks he's far more interesting to look at than whatever that boring shit on your screen is. Plus he's hungry. Always hungry.
Never moves. Like ever. Sometimes you have to poke him just to make sure he's still alive. And then after you've poked him he'll hiss at you. But he loves you deep down, probably because you bought him a fluffy bed.
Pounces on your head every morning to wake you up cos he loves you and wants the first thing you see in the morning to be his furry belly.
Walks across the table to get to you and knocks off a) your coffee cup, b) your laptop, c) your entire collection of glass figurines, d) all of the above.
Will be constantly rubbing against you. Like as soon as you get home he just suddenly appears and rubs against your legs. It's rare for you to get out the house without fur all over you.
Always chasing stuff. Legit, if it moves, he chases it. Butterflies, spiders, dogs, pokemon, anything. Also eats whatever he manages to catch. So hide your other pets...
That crazy ass kitten that just runs around everywhere. Will legit try to run vertically up your walls, so keep him supervised at all times. And watch out for him randomly hiding underneath your legs when he gets freaked out by another cat, especially if it's female.