A person who discovers something for the first time is often referred to as a "discoverer" or "pioneer." In specific contexts, such as scientific discoveries or explorations, they may also be called an "explorer" or "innovator." These individuals are recognized for their contributions to knowledge or understanding by unveiling new information or concepts.
Lucky.
A person who finds it hard to sleep is called an insomniac.
An Archaeologist or a Paleontologist.
hypocondriac
You call the person a bully, jerk, meanie,etc
consumer customer
You could call this person extremely lucky.
Initiator
Pharmacologist
An editor.
you may be able to call this person a blackmail victim.
the first person that made that call