Craig's dad might be abusive by being overly critical, setting impossible expectations, or even taking away things that are important to Craig. There are many possible ways this abuse could play out in the fanfic.
Tatiana Xavier in the 'Tatiana Xavier Secret Story' could be the main protagonist. She might be someone with unique qualities or experiences that are central to the story. It could be that she has a past she's trying to hide or a goal she's striving for secretly. Since we don't know the nature of the story, she could be a real - life figure that the story is based on or a completely fictional creation.
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.
Charles Xavier's fate in the comics is not straightforward. Sometimes he's alive, sometimes he's dead. It all depends on the writer's creative decisions and the direction of the story at that time.
Craig Morgan is likely the central figure or the storyteller in this story. He is probably sharing his own experiences related to his father and the concept of the Holy Ghost.
A Wednesdays Xavier fanfic could also be about a talent show at their school. Xavier is known for his artistic abilities, and Wednesday might have some unexpected talent up her sleeve. They could end up being partners in the show, but there are rivalries and jealousies among the other students. Their journey through the talent show preparations would be full of drama, misunderstandings, and of course, some dark humor.