Mosquito man died valiantly serving to cleanse the city of it's parasite. Just like his original purpose, a blood letting creature, nourishing himself spiritually, and those around him.
is it any wonder that christopher "auteur king" nolan's mosquito man himself experienced a rise and fall unparalleled in the medium of storytelling but for the decline of icarus? coppola almost matched his character development, but it took him an entirely trilogy. from the start, when nolan juxtaposes scenes of the mosquito man and his obsequious ways with the blood letting of doctor pebbles, we get a taste of the insectile metamorphosis to come for our antagonist. like the bug from which he draws his name (and perhaps powers), the mosquito has carved a life of sustenance by the blood of others.
Very good character design by Nolan, having the mosquito man wear such sharp bullets on his chest. Everyone will of course think of a mosquito's stinger when they see those bullets.