Argon was a former control routine program in the Machine world, now an Exiled program in the Matrix earning his living as a thug.
Background
Argon is the most domineering and powerful of the Elements. He likes to think of himself as a careful planner and strategist, and reveres historical military commanders like gods. However, in truth he is somewhat rash in his moves, pushing forward out of hubris and ego more than anything else. Under his expensive suit, he is truly just a thug.
Argon has no qualms about doing whatever is necessary to gain more power and influence over the Matrix.
As part of the Source, Argon was a controlling routine, and as an Exile, he still expects to be obeyed. He is known for his terrible rages when matters fail to go his way, and is jealous and possessive of his paramours (Beryl is the current one). In the end, though, Argon cares for no one more than himself