We could use bladed attacks to tear his costume, potentially messing with his powers.Cosplay's power is too variable for us to actually plan around it. Even whether ambushes are good is dependent on his outfit.
Use caution: robots run on electricity, which is our weakness.For the robots, we should take them out ASAP since they're fragile but potentially hard hitting. That's pretty straightforward, really.
No kidding on that warning. Much like Viscous but more so, this guy's power...not hard counters us, but absent knowledge of his weakness or hitting him before he goes incorporeal I'm not sure what we do to him. Try airborne drugs/poisons and hope he still needs to breathe, I guess? Hopefully, his non-violent modus operandi means we don't have to deal with him too much.
If we could find some sort of nonlethal contact poison that might work if he actually needs to make contact to disrupt us.