Gotham City Sirens vs Azula, Ty-Lee and Mai

Hmm...close one. Keep in mind that the Fire Nation girls are children facing grown women...yeah, frankly, I don't buy that Ty Lee or Mai could have much of a shot of defeating Catwoman. She's at least peak human in speed, has trained extensively against some of the most dangerous martial artists in DCU, and is just physically bigger and tougher than either of them.

Harley is another story. I don't doubt that even Mai (probably the weak link) could spank Harley, although it might be more difficult if Harley was using a gun rather than going for H2H, which she occasionally does.

The big fight would be between Azula and Ivy. I'd say they're comparable in power. Azula's fire is probably faster and will do more damage to Ivy's vegetation, but on the other hand Azula is of the two much more mentally unbalanced and might be controlled by Ivy if she was foolish enough to let her get close.

All in all, it's a tough choice for sure. A lot, in my book, really depends (unfortunately) on Harley, how well she can hold up her end of things and for how long. If she can keep Mai (probably the least dangerous of the Fire Nation trio) distracted long enough for Catwoman to finish Ty Lee, I'd give it to the Sirens just because Mai would last about twelve seconds against Selina and Azula has historically been inclined to flee when she finds the odds against her.

If Harley goes down early, though, which I don't doubt could occur, then Mai could distract Catwoman sufficiently that Ty Lee could neutralize her. In that case, the Fire Nation girls win.

For me, straight toss-up. Slight edge to the Sirens, perhaps, purely because they're adults and probably in general more ruthless, but I honestly can't say.