I remember someone once saying the Outlaws could potentially turn into an Anti-hero Justice League. It got me thinking who could be on the team if they ever add more members. This is just some ideas based around the concept of legacy.
With Red Hood, Artemis, and Bizarro we already have characters representing the Trinity. Lobdell has said the team title of "Outlaws" mainly relates to their attitude rather than trouble with the law.
Dolphin: Aquaman is on the JL, Tempest is on a team with Nightwing, Aquagirl was on a team with Tim before the relaunch and Aqualad is in the Teen Titans. Dolphin was once on the Forgotten Heroes team but with her new take in Rebirth she's more of an outcast.
Holly Robinson: Okay she's not part of a JL legacy but given the way King turned her into a killer I think she could benefit from this team. Holly was once Catwoman for a time in old canon and it would be great if her character could be fixed up.
Jessie Quick or Another Flash?: I'm not an expert on DC speedsters so I couldn't tell you if there's someone that would work for this role. Jessie would probably be in the newly formed JSA but I was trying to find someone wasn't a flat out villain or a Allen/West family member. There are others like Max Mercury but I don't think he'd gel with the team.
Green Lantern ?: I wouldn't normally suggest a GL but Kyle did hang out with Dick's team a lot. Plus there are currently six Earth based GLs. I can't see it happening but if it did either Simon or Jessica would be good choices. Simon for his past trouble with the law and Jessica for her anxiety which would be interesting on this team.
That's all I can think of for now but it would be cool to have a bigger team at some point. Even if it's for a short team up.