John Constantine (Earth-9)

"Yeah, well, if you'd trusted me instead of burning me to Constantine. You blew my chance to get Two-Face. You came out on top. That's all that mattered to you."

- Jinx and Dick Grayson

John Constantine is an associate of Dick Grayson.

Jinx Affair
During Dick Grayson's investigation of Two-Face, Jinx did something that ruined his chances of catching the villain, resulting in Grayson handing her over to John Constantine.

Breaking into S.T.A.R. Labs
At some point, Constantine attempted to break into S.T.A.R. Labs, but was unable to do so due to its advanced security systems.