Initiator
The first person to watch something fall. OR The first person to live.
The person who is the first one to test something is often referred to as a "pioneer" or an "early adopter." They are willing to try new things before others and provide valuable feedback on the product or idea.
An esthetician is a person that acts something like a dermatologist.
Hypocrite
No, a prototype is a first or early version of something. A protege is a person who is helped and protected by another person.
a kindred soul
wingman
A person in their thirties is commonly referred to as a "thirty-something" or can simply be called an "adult."
Such a person is called a "mercenary" or it may be said the person is "materialistic."
A person who creates something totally new is considered an inventor. He or she creates something that has never existed.
a so called friend