I'm not very familiar with this specific novel. It could be a story about Alpha Aiden and Sienna, perhaps in a fantasy or paranormal setting where Alpha might refer to a werewolf pack leader or some sort of dominant character. Without reading it, it's hard to say exactly what it's about.
La La Land isn't based on real events. It's a creative work that imagines a charming and artistic story. The characters and their experiences are crafted for entertainment.
Well, the 'LA Weekly Best LA Novels' could be a curated list of fictional works. They probably showcase different aspects of Los Angeles like its diverse neighborhoods, the entertainment industry's influence, or the complex social fabric. It could be that these novels are chosen based on their writing quality, how well they portray the city, and their ability to engage readers with LA - based stories.
The cartoon you mentioned is called Teyvat, a Japanese anime that debuted in 2002. The cartoon told the story of an adventure between a young man with card magic, Xiaotu, and the three female leads, Sakura, Tomoyo, and Snow Rabbit. Riona was a character in the cartoon. She was the assistant of the card magician " Moon God " and Sakura's good friend.