Igor is a recurring important figure in the Persona series. His role is crucial in every Persona protagonist's  journey.

Igor is no longer seen with the phone but he still handles Persona fusion through the use of cards. Additionally, Igor is accompanied by an assistant named Margaret. Only the protagonist can enter the Velvet Room, and he does so for the first time in a dream. None of the other Persona users can see the entrance to the Velvet Room. 

In every Persona game to date, Igor has played the role of Proprietor of the Velvet Room, a space which transcends both dream and reality. As the proprietor, Igor provides insight to the protagonists regarding their powers, emotional bonds, and possible dangers that await them in their journey. Igor also provides the vital services of Persona fusion, which allows the creation of vastly more powerful Personas from preexisting ones; and the use of the Persona Compendium, which allows previously created and/or acquired Personas to be recalled at a later time.

Despite his rather striking appearance, Igor bears a calm and courteous demeanor while speaking with the protagonists. Though the well-being of the protagonists is important to him, he reserves the disclosure of certain information for more "timely" points in the story. During conversations concerning the protagonists’ actions, Igor opts for rather cryptic comments that tend to foreshadow coming events and possibly the outcome of the story as a whole, regardless of whether or not those comments are at the time understood (which may be his intent). This suggests that Igor may have near-omniscience, though by his own admission, there are things that even he can't foresee.