Maze would be perfect. She understands how Hell works and is known as "Hell's best torturer", but her time on Earth has given her insight into how humans work, which means she could make changes as to what happens to the souls who have been weighed down with misplaced guilt and have sent themselves to Hell despite being good people. She is also not as malevolent as others on this list, meaning she is unlikely to use her status and power to create trouble.