User can become mosquitoes

Pros:
-user can fly for long periods
-user can track targets from their blood
-user can become a swarm of mosquitoes or a human sized mosquito
-user has thick cartilage shell on skin
-quick is rare and unlikely to be passed down

Cons:
-user MUST drink blood to survive
-user will prefer a hot and humid environment
-user will creep out others
-if quirk has properties of Anopheles mosquito, all females can carry malaria parasite

Weakness: cold
User will slow in movement