Someone who frequently messes up things might be referred to as clumsy, careless, or accident-prone. Informally, you might also call them a "screw-up" or "blunderer." These terms emphasize their tendency to make mistakes or mishandle situations. However, it's important to use such labels with care, as they can be perceived negatively.
Testator
arceologist
A pervert
a stalker
Not always, no.
A loser
Sociable
You call them a snotty jerk. They are also selfish!
Someone who always gets what they want is spoiled.
An Electrician
germaphobe.
A nudist.