Mosquito

The mosquito is a mosquito. It was killed by Genos.

Appearance
Just an average mosquito you'd usually see.

House of Evolution Arc
Saitama is watering his cactus, as a mosquito lands on his arm. Saitama attempts to kill the mosquito by slapping it, but the mosquito flies up unharmed. This angers Saitama, as he stands up attempting to kill it again, and again.

The mosquito's last appearance is seen as it is flying away from Saitama, who is attempting to spray it with some bug spray. Genos warns Saitama about the large swarm in front of them, Genos uses his Incineration Cannon to destroy the swarm, killing all the mosquitos in sight.