Mushoku Tensei features a sword and sorcery-esque vast world with an extensive cast of characters. The series is about an unnamed Japanese NEET who reincarnates into a fantasy world as an intelligent, gentleman persona under his name Rudeus Greyrat while retaining his memories in secret, being determined to live his new life without any regrets.
Early response to Rudeus was primarily negative due to his perverted nature to the point the original writer noted that such was the point of his characterization.[25][26] However, his relationship with his mentor and his father Paul were praised for bringing the narrative hidden depths.[27][28] Roxy became a break out character in her own series which was praised by Otaku USA for being accessible but hoped to further develop her in future volumes.[29] Comic Book Resources said that Mushoku Tensei is enjoyable thanks to the large amount of characters.[30] TwinInfinite listed Roxy as one of the best teachers in anime.[31] In a manga review from the early arcs, Akiba Station noted that while Rudeus gets into less fights, he is contrasted by the parallel adventures of Roxy.[32] Roxy' figurine that Rudeus creates in the series was popular enough to get its own replica in real life.[33]