That depends. Usually, if the person is good at everything that they are doing, they're referred to as a 'Jack of all Trades.'
>> A person tripping over everything is called? A "clutz."
They are called hackers.
A person involved in an argument can be called a participant or a disputant.
Regretter
A person who has done everything you have done would be considered a counterpart or a peer.
The narrator.
all-rounder
Hippy
someone who carefuly chekes everything out is
Are you referring to narcissism.
Self-Hatred
Engineers