Story (or as I like to say. LORE)
The Overseer has been alive since before normal humans have existed. But he's physically 42, forever. He started working at The Foundation when they tried containing him. He instead offered to work for them.
After some time, he wanted to create a portal to help other dimensions/universes too. But the O5 didn't approve of that. So he kinda just... killed them, and had his soul shattered into 13 pieces. Which Map Bot had to gather across universes/dimensions. After that, he changed The Foundation up quite a bit...
...At least, that was the truth for some time. Since this Foundation's Universe was "reset", some things may have changed.
Aoki Sakurada/The Overseer
Noko
Dr. Fundus