“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. Additionally, he also takes a neutral stance himself, and almost never directly interferes or gives obvious warnings to any people or anything that he had a contract with.” - Persona 5 Wiki

Voice Example

https://www.youtube.com/watch?v=9O_7-UCW9Pk