Family/Best Friend
a person who is always in a good mood is called jolly, or enthusiastic
A person who always thinks the worst will happen is known as a pessimist.
person always wants to win
A person who always expects good things to happen is called an "optimist" A person who always expects bad things to happen is called a "pessimist".
Incessant complainer
A hypochondriac
My friend Nathan.
A person who is always learning new things is often referred to as a lifelong learner.
Caring person
Dry
Photogenic and photoholic
Pacifist