Yes, there are storylines where Doctor Strange takes on a more morally ambiguous or outright evil role due to various circumstances and magical influences.
A book is considered a novel when it has elements like a fictional storyline, a diverse range of characters with their own arcs, and enough pages to delve deep into the story and its various aspects. It goes beyond a simple account and offers a rich and immersive fictional experience.
It usually becomes canonical when it's officially recognized and incorporated into the main storyline or lore of the original work by the creators or the relevant authorities.
It's not strictly defined by word count. Usually, if a story has more depth, complexity, and a broader scope, it can be considered a novel rather than a novella.
Kakashi would be deeply concerned. Given his relationship with Sasuke, he'd feel a strong sense of duty to save him. He'd use his extensive network of contacts within the ninja world to try and find out where Sasuke has been taken. He might also reflect on his past training with Sasuke and how he can use that knowledge to anticipate the kidnappers' moves. He'd be ready to face any danger or obstacle in his path to rescue Sasuke. And he'd be constantly thinking about Sasuke's safety and well - being during the whole process.