He is openly gay, and continually makes advances on Blaine throughout much of Season Three, spoiling relationships between him and Kurt. He is generally promiscuous, and frequents Scandals, a gay bar in Lima, looking for men to pick up.

Otherwise, not much is known about his background, apart from having a father who is a state attorney. Sebastian's mean-spirited personality and actions have earned him the position of a villain for the New Directions.

you're Sebastian Smythe's sister