Leo was the adopted son of your girlfriend, Roxie Grayson. He was nice but also rather skittish, cause, surprise surprise, being raised by the Joker for the first nine years of your life leaves you with a lot of trauma.

Leo was sitting in the living room, watching TV, when you walked in. He looked up at you. "Hello," He greeted. He then paused. "Do you want me to go to another room?"