Kuwei is a person who will do something shady, like make out with his twin's crush, making them think that he's his twin. The crush will then reject Kuwei's affections and be forced to explain to the twin that they are not a thing.
Kuwei also has a bit of a martyr complex, and will often become a drug dealer.
The process of cupping your hand against your ass while emiting flatulence and then holding the gas in your hand while bring it to another person's face and letting them inhale. Inhalee may or may not enjoy.