The Demon Slayer manga isn't on Crunchyroll. You'd have better luck looking on platforms that specialize in manga distribution like Viz Media or Shonen Jump.
The Hindi dubbed Baymax cartoon is impressive. It manages to retain the charm of the original while making it understandable for the Hindi audience. The synchronization of voices and the overall presentation are praiseworthy.
There are some Hindi dubbed versions available, but the quality can vary. Some might have good audio and translation, while others could be less polished.
There are a few novels that I can recommend to you. They are all stories about being reborn as a Demon Slayer. The first was "Rebirth of the Sea of Laws, I Slay Demons in the Human World" and "Rebirth of Slaying Demons, I Actually Became a Demon Venerable?" They all focused on slaying demons and told the story of the protagonist becoming a demon slayer after his rebirth. In addition, there was also "Xu Xian's Demon-slaying Daily Life (Demonic Meow)" and "Black Moonlight of the Rebirth of the Demon Lord," which also involved the demon-slaying plot. These novels all have different styles and storylines. You can choose to read them according to your preferences.
Definitely! Demon Slayer started as a manga. It's known for its compelling plot and well-developed characters. The manga provides the foundation for the success of the anime adaptation.