No. Reading manga is just a hobby. It doesn't mean you're a weeb. A weeb is typically characterized by an excessive and sometimes inappropriate infatuation with all aspects of Japanese culture, beyond just reading manga.
The use of anime - related knowledge to create fear. In weeb dm horror stories, the sender might use a character that the receiver loves and turn it into something menacing. They could say things like that character is now cursed or something bad will happen to it. This plays on the emotional connection the weeb has with the anime world. Also, the anonymity in DMs can be really scary. You don't know who is behind those messages, and they could be anywhere in the world, plotting something evil.
There was a story where a weeb got a DM from an unknown source. The DM had a link to an anime - related video. But when they clicked on it, it led to a series of disturbing images that seemed to be some kind of dark, anime - inspired nightmare world. It was a shock as they were expecting a normal anime clip.
Definitely not. Wednesday is a made-up tale. It takes us into a fictional world filled with magic and intrigue. It's all for the purpose of giving us an engaging and enjoyable viewing or reading experience.
One way to develop their relationship is through acts of kindness. Maybe Xavier gives Wednesday a piece of his art that he made especially for her, which shows that he sees her in a special way. Wednesday, in turn, could protect Xavier from a bully at school. Another aspect could be through humor. They could start making inside jokes based on their strange experiences at school. As they get more comfortable with each other, they might even start to develop feelings that are more than just friendship. For instance, Xavier could find himself getting jealous when another student shows interest in Wednesday, which would be a sign of his deeper feelings for her.