So Sejima

Name: So Sejima
Sex: Male
Age: 60 spoiler | 61 (in AINI Past)
Birthday: December 7
Profession: Congressman spoiler; Ex-Member of Parliament (AINI)
Likes: Authority, Fame, Assets
Dislikes: Anything that threatens the above
Hobbies: Mahjong, Golf; Nishiki carp breeding (AI); Raising Koi and Kappa, Kusemon GO (AINI)
Skills: Grasping people's weaknesses, applying pressure, and making them obey.

In AI: The Somnium Files:
Congressman So Sejima is a member of the post-war generation. He grew up poor, which gave him two things: his motivation for seeking power and wealth and his vindictiveness toward the upper class.

In AI: The Somnium Files - nirvanA Initiative (Past):
So Sejima was once a member of Parliament who had a strong influence on the political and business worlds. Although he is no longer a politician, he still owns a wealth of assets and holds tremendous power.

From the in-game character descriptions