I'm not sure specifically as there could be many different things in such a novel. Generally, in an isekai (another world) type of novel, it might be about a sage (kenja) who is reincarnated (tensei) and embarks on a journey of becoming extremely powerful (musou).
Since I haven't read the novel specifically, I can't say for sure. But it's likely to have the reincarnated sage as a main character. There may also be characters who help or oppose the sage in their journey.
In the chapter 'Tensei Kizoku no Isekai Boukenroku ch10 novel', perhaps the noble who got reincarnated continues their adventure. They could be exploring new regions, encountering different races, or getting involved in local politics. It really depends on the overall plot direction of the novel.
Yes. I can recommend two doujinshi novels to you: "Three Kingdoms: Cao Cao's Eldest Son Assassinated Dong for His Father" and "Time Travel to Orochi Musou." The former was the story of crossing the Three Kingdoms and becoming the eldest son of Cao Cao, obtaining the opportunity to become a Peerless Battle General, while the latter was the story of the protagonist buying a controller and crossing into the Orochi Peerless, fighting alongside historical figures. I hope you like this fairy's recommendation. Muah ~๐
The 'Roku Christmas Story' might be a unique, fictional account. It could involve Roku as a character in a Christmas - themed narrative. For example, Roku could be a little elf in Santa's workshop whose job is to make sure all the Roku - powered devices in the world are ready to stream Christmas carols and holiday specials. Or it could be about a person who gets a Roku as a Christmas gift and how that changes their holiday entertainment experience.