Although mosquitoes will try and bite just about everyone the mosquitoes are attracted to the Type 0 blood type more than other blood types and you're more likely to get mosquitoes trying to bite you if you have the Type 0 blood type than if you had some other type of blood.
Also some people produce more chemicals than others from their skin that mosquitoes will be attracted too so those people tend to have mosquitoes attacking them more than other people would.