Decimus sees himself as the control subject in the science experiment called life. Often labeled as "boring" and "predictable", Decimus keeps his wild and experimental side reserved for pet projects. This boring lifestyle leads to him being considered anti-social and when he does join others, instead of relaxing he prefers to keep quiet and observe.

While Decimus will see a job through to its conclusion and put forward his best effort, it’s still just a job. Decimus's true loyalties lie to his friends, and through thick and thin,he will stand by them and die for them if needed. This loyalty is reserved for those who have earned Decimus's trust, putting him at odds with other Mercenaries that are only doing a job for the money. This also makes it harder for employers to trust his motives, often times creating extra competition and difficulty finding work. None of it matters to Decimus, though, because loyalty to his friends is not something credits can buy.

People tend to reverently follow Decimus’s lead and look up to him in difficult situations. Whether through inspirational behavior, fear and manipulation, or belief and hope for a better future, they think that Decimus genuinely believes what he does. This is all a clever facade, however, as Decimus is not always as upstanding and respectable as his followers believe. He is no idol, but an opportunist who knows how to manipulate a crowd into bettering his own machinations.

Decimus is devoutly loyal to his House or Clan and will follow orders unquestionably. He would sacrifice his own life to protect his House or Clan from harm. This attitude, however, often clouds his ability to see things from an arbitrary or objective point of view and he can come off as extremely narrow-minded.

Decimus is utterly devoted to success in combat, no matter the mission, no matter the cost. He has spent his life building himself in the image of war, utilizing a dogmatic regimen that has led him to a single-minded obsession with military success and requires intense physical and mental training. This training, however, has come at the cost of anything resembling empathy or concern for others - even his superiors and subordinates.

Born with an intractable will and limitless courage, Decimus will stand in the face of insurmountable odds and never retreat. Despite the fact that such acts of heedless bravery are inspiring and will sometimes result in victories worthy of song, just as often they result in his allies getting wounded or killed.