At first, Dracula does not trust Jonathan because of his general dislike toward humans, and this gets even worse when Jonathan falls for Dracula's daughter, Mavis. As the two spend more time together, Dracula begins to trust Jonathan more, even enough to tell him about his tragic past. The two become friends, and Jonathan reminds Dracula how to have fun and teaches him to trust humans again. In the end, Dracula trusts Jonathan enough to let him date Mavis, though some fan interpretations say that he and Jonathan may have been romantically involved with each other somehow. The relationship varies from fanfiction to fanfiction. While most fans see them as close friends or family, some fans prefer to make their relationship more intimate.
Note: Please add only ones that are part of the RotBTD fandom