how to turn into a demon

Yes, Tanjiro does turn into a demon in the manga.

No, Izuku doesn't turn into a demon in the manga. It's not part of the original storyline.

No, Deku doesn't turn into a demon in the manga.

Yes, Ciel does turn into a demon in the manga.

I recommend the fantasy immortal cultivation novel,"I'm a Bull Demon in Africa." Although the main character of this novel was originally a wild ox that could cultivate immortality and not a human, it also fits the plot that you mentioned that the main character could become an ox demon. Moreover, there are many interesting plots and details. Personally, I think it's very worth reading. I hope you like this fairy's recommendation. Muah ~😗

I'll recommend a novel for you right now-- The story told the story of a young man who was labeled as "need to be vigilant" and grew up in Taoism, which regarded demons as their mortal enemies. In order to save everyone in the sect's trial, the protagonist was possessed by the demon seed's Yang soul. From then on, his life was destined to be different. I hope you like this fairy's recommendation. Muah ~😗

I recommend "I Am the Southern Demon King." This novel is about an expert of Internal Martial Arts who became an evil demon king after suffering injustice. The protagonist, Chen Nan, swore that he would no longer believe in justice. In his second chance, he was reborn as the Dark Lord in charge of the underground. This novel turned from a pitiful, righteous person to an evil demon king. It showed the process of the character's transformation from being full of justice to evil. It was very exciting. I hope you like this fairy's recommendation. Muah ~😗

To turn text into speech, he needed to use the text to speech tool. These tools could convert text on the computer into speech so that people could hear it read aloud. Some common tools for converting text to speech included: 1 Google Translate:Google Translate can convert text into speech and read it out loud. 2. MicrosoftTranslator: MicrosoftTranslator is also a tool that can convert text into speech in multiple languages. 3. Android Audition: Android Audition is an audio editing software that can be used to convert text into speech. 4. Audacity:Audacity is a free music editing software that can be used to convert text into speech. The usage method is as follows: 1 Open a speech-to-text tool such as Google Translate, Google Translator, or Android Audition. 2 Find the text that needs to be converted in the tool and click the right mouse button to select the "Read aloud" option. 3. Choose the voice, speed, and volume to suit your needs. 4. Wait for the tool conversion to complete. Translating text into speech required some skill and experience. Different tools had different ways of using them and different effects. He could choose the appropriate tools and methods according to his needs.

The reason why Li Bing turned into a cat demon was still unclear. In the series, Li Bing's transformation might be related to some kind of drug or experiment, but this was only speculation. The specific plot still needed to be interpreted. However, Li Bing's special ability and the empress's trust in him indicated that he had superpowers and was stronger than Di Renjie. In short, there was no definite answer to the question of why Li Bing became a Catwoman.