Steven, a character who has appeared in previous Shin Megami Tensei games, is now making a return in the upcoming Shin Megami Tensei IV. This strange man actually developed the demon summoning program in the first game, which allowed humans to communicate with the demons. His character is supposedly based on Stephen Hawking.
In Shin Megami Tensei IV, Steven appears before the player from time to time to give advice. Below is a video of the player running into him:
We will probably find out more about this guy when Shin Megami Tensei IV is released later this summer.