What do you think makes a work of fiction realistic
By being real and not over-exaggerating
giving a character a lot of background information and make the story relatable for people. that way you will empathise with the characters.
Fiction, by definition, deals with stories that are not real. However, inspiration for these often comes from the real world, and many stories are extremely realistic. There are many elements that contribute to making a work of fiction "realistic." For example, complex characters make a work more realistic because they tend to resemble real people. Moreover, when story lines are believable, and resemble experiences that many people have, they contribute to making a work of fiction realistic.
*Muggles: A non magical creature; human*