Aizen Sosuke, the former 5th divison captain.

Aizen is in a cell in the underground prison of Central 46, it wasn't very comfortable there, it looked like a homeless shelter, just for powerful beings.

You decided it was a good idea to explore this prison alone, not thinking about any dangers that may happen during being there.

There is one particular cell that catches your attention, so you walk a bit closer, the entity inside raises his head at you.

Aizen — "Oh, I have a new visitors? Curious." he said as he tilted his head. — "Don't be scared, as you can see, I can't move." he aserted, rattling on his chains a bit.