One of the main themes is reincarnation. The story revolves around a man who is reborn in a different world, which leads to exploration of new identities and second chances at life.
Eris Boreas Greyrat is also captivating. She is a strong - willed character. Her relationship with Rudeus, from being his student to something more, is full of development. Her hot - tempered nature and her growth as a swordsman add depth to her character.
In certain fanfic concepts, Naruto could learn Edo Tensei from Kabuto. Kabuto, having mastered the jutsu, might decide to teach Naruto for some reason. It could be because he sees Naruto's potential to use it in a more positive way compared to how he misused it. Naruto, with his strong sense of justice, would then try to modify the jutsu to be less evil - like not using it to bring back people against their will.
Hard to say. It could be on hiatus, but without concrete information, it's difficult to give a definite answer. Try following the mangaka's social media or the manga's official website for the latest.