Yeah, I guess the Joker would scare anybody. I mean dang, he's gotta be the scariest clown ever created. Joker himself is a genius really when you think about it.
ok.
Batman
Black Canary
Shiva
Robin
Batgirl
Azarel
Mr Freeze [Gotham is his home]
Clayface [Gotham city is his hometown too]
Nightwing + Oracle
Joker[wil fight to reclaim the limelight],
Two face[coz he knows what's right], Lucky Hand Triad [cos duh!]
would rally against the invaders
Carnage, Shriek & Co, YSSAT[has issues], Scarecrow, Hush, Black Mask, and anyone with a grudge against life in generall would unite to stomp on Gotham
Just watch Azarel/Shiva/Joker shrug off shrieks mind assault and claim a quick kill. when the System is Pumping even Xavier'd be advised to drop the act & make peace with G.d.
Those who she can't control are blasted into next week though Ditto. Joker'd have to have a nuke or something that could possibly scare Carnage(I can't imagine him being scared of anything other than sonics though. He doesn't seem like the type to fear death) like he did in the crossover. Otherwise his @ss is grass and Carnage is a lawnmower. The moment Joker expresses any disagreement is the moment Carnage becomes the new Joker(by of course wearing the old Jokers costume..........& skin. Carnage is a sick bastard)
zsaz is the guy who kills for .... well he kills and tattoes each kill on his skin , he's running out of space ... fast. Good thing he's in a warm iso-cube at Arkhum.
caucasian
looks nazi-ish
never wears a shirt/top or shoes
can kill/mortally wound with almost anything , paper clip, grain of rice, fingertips, cup o' joe,
Killing Machine