Joker's trait is damn near useless online unless you find someone with a great connection or you know how to lag compensate well.
I can do the latter a bit, but not consistently.
I honestly think it's the worst trait, though I don't think he's the worst character at all.
I feel that it's probably(definitely) better in an offline setting, online it seems like the window on the parry is tiny as hell and the fact that it doesn't work on jump ins is kind of shitty because every noob online trys to do jump ins after everything(I can easily hit them, but what i'm saying is I cant use the parry against these people).
The worst part by far is the actual trait itself, I barely notice any boost in mobility, not enough to matter, the way he is he doesn't even need it, would have made a lot more sense to give him multiple counters.
as in back + 4 is a counter that leeches health, down + 4 is a counter that boosts his damage, and so on.
Or they can at least make the Ha's permanent, I don't think the Joker would be broken or even close if he had the Ha's for a whole round.
Still my 3rd favorite character so far.