Yo-Yo (Flashpoiont)

First Appearance: Flashpoint (2011) Issue 1: Flashpoint Part One

Yo-Yo is the female side-kick to the Joker and enemy to Batman and Gotham City.

Batman gives chase after her across the roof of Wayne Casinos and tackles her to the ground. He demands to know where the Joker is. But she says that "the Joker is in all of us" and saying that everyone in the city is a little bit crazy. Batman denies that he is, but she says no one in their right mind would stay in Gotham. He asks again where the Joker's fun house is, before threatening with "while you still can." She replies that it is on the tip of her her tongue. Batman says it needs to come out, scratching her glasses. He interrogates her to try and get Joker's location after she had kidnapped Judge Dent's twin children. Yo-Yo laughs telling him that he is probably too late and they may be dead. Batman tells her "then so are you" before throwing her off the roof. 

She was saved just in the nick of time by Cyborg, who she throws her arms around and tells him that she will surrender "for him." To which he replies that that idea was smart.