How do you think Youkai feel about their far-off lives?
Urumi used to drown people, but now helps them instead and runs a fishing business. Does she ever look back on her history and victims and regret what she did or maybe she just sees that past as being a different person? Youkai have been around for many centauries after all and many of them don't act very sagely, so I don't think they have perfect memories or mature over time like humans do. Perhaps they look back and don't even understand why they did certain things because they no longer have those impulses? Are there any examples of Youkai that became more evil over time instead of less and do they feel the same way as when they were good?

It would be kind of funny if they saw being murderous and violent as a sign of immaturity.