"Everyone needs something." It's a matter of whether they know what it is they need, or realize they need something at all.

But he stays silent and listens as Thanatos reasons his way through things. The question at the end comes as a surprise, and he takes a few more moments of silence to think. "Not that I know of, but my world also doesn't have a god of death either." Wait. "Does your world not have a god of life?" Thanatos's world has too many gods to keep track of, including a god specifically for death, but it doesn't have a god of life?

It's not as though Ryo needs further evidence that Thanatos's world is broken, but...wow.