I used to have domesticated rats. They are very social and get will be affectionate towards their pack - this means you, once you own them and take care of them you’re one of them as far as they are concerned. They love to climb and explore, sometimes jumping from crazy heights and shrugging it off like nothing (had rats jumping off my wardrobe). They love to participate in your activities by sitting on your shoulders while you’re doing something and snuggle inside your sweater (making it look like you have an alien about to burst out of your chest). They can be jealous, I’m pretty sure they can distinguish between man and woman easily. They are cunningly intelligent, can open locks, play fetch and learn commands.
On the flip side, they stink, need space and activity. Bored rat in a cage will suffer, especially alone, they need company and some freedom. They will take your time, require you to clean their cage constantly and change your behaviour to adapt to them, a bit like cats.
The tails seem gross and the beginning but then you get used to it and they’re kinda cool. Ah and they have the cutest faces ever and their hands/paws look incredibly human.