If I had to guess...

The conical hat is obviously the silhouette guy. Hopefully he gets revealed.

The city thing is maybe Robin reading the Harley script.

Cerberus...well, I would guess either Shamrock has the Inu-Inu, Model: Cerberus, or maybe it's related to the Harley thing.

Or maybe there's a monster like Garm nearby. Dunno.
 
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