This is an old topic, but I never understood why the ex-Shinigami just quit acting as a reaper, left the Shinigami realm and never to return, gave his glasses and his original name and insist that everyone call him Undertaker, and work as a funeral director for humans for a time, then start making BDs and go further into hiding? Is he just so very tired of everything around himself? Will Yana shed some light on what his reasons were? Or was his mind broken all along?
He, at one point, says curiosity led him to experiment with cinematic records. However, he must be leaving out certain other, more personal motives. I think there is a political element to it, since he makes it quite clear he doesn’t like the queen or how she operates/delegates. There might also be a romantic element to it, since he could really turn out to be Cedric K. Ros–. If he was romantically involved with one watchdog, became the father of the next watchdog, and then saw that one get replaced by yet another generation? This would definitely fuel his anger towards the queen he probably *already* disliked.
I also hope we learn more about him, and I seriously *expect that we will*. Something made him abandon his post as a reaper and get heavily involved in the affairs of humans. There’s no way it’s *just* curiosity about life and death.