I find that having a social character to start off with is the easiest way. Get to know people and their characters in a method that's straightforward and easy! Once you've found a good group of people where you all enjoy interacting with eachothers' characters, that's really the time to let an antisocial character fly. From an OOC standpoint, it's a lot easier to get a person to interact with an antisocial character if they already kinda know the player. It also helps with starting a scene instead of wishing/hoping a random interaction will somehow happen. But antisocial and unreactive are different things, which often get grouped together. If you are trying to go for an antisocial character in a social setting (like say the Quicksand), react to then environment. Throw some RP hooks. Message a person OOC if you need to. Ask a friend with a social character to come in and cause a spectacle if they can.
