The Black Panther comic has its own unique fictional universe and narrative that is not related to the Black Panther Group. The comic's creation was based on comic book concepts and storytelling rather than any direct connection to the group.
One great 'Black Panther' fanfiction is 'The New Wakanda' which explores a Wakanda that has to face a new, unseen threat. It has great character development for T'Challa and his sister Shuri.
The Legend of Black Panther is an audio novel that can be listened to for free. However, the search results did not provide clear information on which platform could be listened to for free. Therefore, I don't know the specific platform for free listening to books.
It's very important as it gives the backstory. It shows how the Black Panther character and the Wakandan nation came to be. It sets the foundation for the character's values, powers, and the unique culture of Wakanda.
The black shadow avatar was a very popular avatar style recently. These avatars usually had a black background and a black shadow image, giving people a sense of mystery and loss. Black Shadow avatars might have different design styles, such as Shadow Flowing Light, Simple Style, etc. You can download and use related materials and pictures on the Panda Office website and Qianku Network. However, the search results did not provide any information about the specific meaning or origin of the black shadow's avatar.