A paragon (a model of excellence)
this person is called a soldier
A solider
A turncoat.
Admiral
Non-partisan or independent.
I would call them a role model.
Role Model
A person who is suspicious of the motives of others can be called paranoid or mistrustful.
vocalist
a snitch
a homosexual
You call the person a bully, jerk, meanie,etc
A person who does things for others may be an assistant or a helper.
A person who sacrifices themselves for others is often referred to as selfless or altruistic.
Insensitive.
demophobic,androphobic
My kids call me "Dad".