Im starting to figure that Dainsleif will either just be a major side character to the game, or he will be a playable character. His information leads to either a side character or an unreleased new playable character. But if you really pay attention to Dainsleif's design, you will actually notice that Dainsleif has clothing similar to Paimon's and the Unknown God that we meet at the beginning. Maybe they all have the same vision--since I'm pretty sure that Paimon's and the Unknown God's information about their vision or if they even have one has been released yet. In all, I hope that we will get more information about the game, and Dainsleif really does seem like an interesting and powerful character when it comes to if he is playable and his playability, I hope that he will be playable sooner or later in future updates!