Emperor Solus was said to be an enthusiastic theater-goer and patron of the arts. He commissioned the building of an airship for the Majestic Imperial Theater Company so they could travel the realm and bring their performances to the far reaches of the Empire. This hearkens to the Tantalus Theater Troupe from Final Fantasy IX.

Solus, or Emet-Selch by his Ascian name or Hades by his true name, is more eccentric and talkative than the average Ascian, being unpredictable and condescending towards his allies. His eccentricities often leave those around him exasperated or enraged. He remains convinced of the importance of the balance between Light and Dark and considers his people the definition of perfection while viewing the "broken" races mere imperfect parodies of his kin. He extends this contempt to his mortal grandson, Varis, having no real interest in the Empire outside its intended purpose of spreading chaos. His resentment towards Varis also stems from him resembling his firstborn son, whose death serves as a final reminder of mortal imperfection in Emet-Selch's eyes. However, he does show interest in certain mortals who underwent the Umbral Calamity numerous times.

Emet-Selch is a loner, and though he operates with full intention to bring about the Rejoining, his actions are often considered unpredictable. Beneath his eccentricity and cheerfulness, Emet-Selch bears the burden of centuries of sorrow and pain over all that he and his people have lost, and a burning hatred for Hydaelyn and all who fight in Her name. In contrast to the maniacal scheming of Lahabrea, the passionate rage of Nabriales, the patronizing arrogance of Igeyorhm, and the cold rationality of Elidibus, Emet-Selch is filled with deep melancholy over Amaurot's fall. Whenever he speaks his true feelings, his pain and despair, his voice deepens and becomes more gravely.