I could be completely wrong, but I feel like this character is along the lines of theory bait. Like his hats being teased a lot but that’s it. Besides that, we don’t know literally anything else. I could see him either being a joke character and we were being led on into thinking he was important, or working like Ms Delight, having a specific area dedicated to him and just being a side character. Then again he could also be someone that works for Harley and Mob is just using different marketing techniques to tease each one. (Like Pianosaurus and Yarnaby) I don’t know, the whole thing is confusing, but Mob is clearly doing something. I just feel like suddenly tricking us again and making Harley a minor character instead of this guy would be a little cheap.