Argus was shown to be a very stealthy man who relied on sneaky tactics in order to accomplish his goals. This was shown in the fact that he owned an invisible airship he used to travel the world in search of treasures. He used this ship to stealthily track down his targets and steal anything he desired to obtain a fortune. Argus further showed his preferred use of stealthy tactics as he relied on his Honedge to spy on Diancie, and also tracked down the activity of Marilyn and Riot from within his airship. Argus also only attacked Diancie once she had accomplished her goal, and appeared at surprise along with Millis to capture it.
Argus was shown to have a sweet tooth,
more specifically, a chocoholic. This was shown as when he was spying on Diancie and his rivals, he was holding a box of chocolate and eating a lot of it. This behavior often worries his daughter Millis, but despite her claims of concern over his health, Argus continues to eat chocolate. He also often talks about the individual chocolates he eats, such as their origins, and what they are made of. His obsession with chocolate also caused him to open and run a chocolate shop after he gave up his criminal life, which he operates along with Millis.