Sell the Kids for Food

This is another one of Scott Snyder's new villain creations. First seen in Batman vol 2 #43, during the Iron Man-esque Jim Gordon Batman arc, Mr. Bloom is equal parts technology villain and supernatural monster. Mr. Bloom introduces "seeds" that unlock superpower abilities but with deadly consequences, which he gifts to unsuspecting citizens. Physiologically, Mr Bloom can manipulate his size and shape, can manipulate fire, ice, and mechanics. His MO seems to be to "sow seeds" of chaos.

Sometime after the events of Scott Snyder's Zero Year, scientist Daryl Gutierrez developed a project using nanotech to create superpower abilities in normal humans. The unpredictability of the nanotech reactions, and the public reaction to mysterious new superpowered people forced Dr. Gutierrez to scrap the project. However, the nanotech seeds resurfaced years later, in the possession of the mysterious Mr. Bloom. Mr. Bloom's longterm plans aren't very clear, other than creating conflict and chaos in Gotham. He does come into conflict with Gotham crime, specifically the Penguin.

Mr. Bloom has great potential to be a unique villain in Gotham. He has elements of the Joker's MO, but also seems to have elements of crossroads demons, and bogey man tropes. He is very obviously influenced by the creepy pasta creation, the Slenderman. Mr. Bloom is Lovecraftian horror, a shadowy agent who's actual existence is hard to pin down. He is dangerously manipulative, able to weave himself into the psyche.