The perfect killer

A person that blends in
But not enough to be in the background
A person that is friendly
But isn't afraid to make a stand
A person who is quiet
But talks the right amount
A person who has a flawless character
But isn't afraid to reveal their mistakes
That is the first test

A person who knows the body
But not too well
A person who is methodical
But is also reckless
A person that is strong
But is seen as weak
That is the second test

The third and final test is simply
A yearning to kill
A desire or a will
To chase down a victim
Relentlessly
Bloodthirsty
Mercilessly
Unaltered by the police
Who hunt's the person down

Does such a killer exist?
Who knows...
But you won't see that person coming for you
Even
If
The
Killer
Was
Looking
At
You
In
The
Eyes