The main character is definitely Candace. Regarding the 'them', they could be a group of characters who are up to something that Candace doesn't approve of. It might be a group of mischievous kids if this is related to a family - centered show. Or it could be a bunch of rebels in a more dystopian - type of fanfic setting.
Since we don't have more context, it's difficult to say precisely. However, in general, a fanfic with this title would likely center on Candace as an active agent. She might be in a position of power or knowledge that allows her to 'bust' the other characters. It could be a story of her journey in doing so, with various obstacles and plot twists along the way. Maybe she has to overcome her own fears or deal with the consequences of her actions as she busts the others. It could also explore the relationships between Candace and the other characters, and how they change as a result of her actions.
Well, clearly Harry is one of the main characters. Since the title focuses on him looking like an angel, he's likely to be central to the story. There might also be his friends, for example, Hermione and Ron. They could play important roles in either noticing Harry's angel - like qualities or in the events that unfold around him.
The parents, Mom and Dad, would probably play a significant role as they are the ones who could potentially bust Candace. Also, there could be some minor characters from the original show like Perry the Platypus. He might be involved in some way, perhaps he accidentally reveals Candace's plans which lead to her getting busted.
When it comes to a 'phineas and candace lemon fanfic', it could also be a way for fans to express their own feelings about the characters. Some might write it to show their love for the show in a different way. It could be that the 'lemon' part is just a catchy way to make the fanfic stand out, or it could actually involve some sort of tangy or unexpected elements in the story.
There might be other characters who oppose Brynden Rivers. They could be heroes or just ordinary people trying to stop his extreme actions of 'burning them all'. Their motives and backstories would add depth to the fanfic.
Obviously, the little child is one of the main characters. There might also be some adults or other children who follow the lead of this child. Maybe there's a gruff old man who at first doubts the child but then becomes one of the child's most loyal followers.
The parents, Linda and Lawrence, would probably be important characters. Since Candace has snapped, their reactions to her new behavior would be a key part of the story. There could also be some new characters introduced, like a mysterious mentor who helps Candace come up with her plans or a bully who takes advantage of her new - found 'edge'.
Obviously, Harry Potter and Draco Malfoy would be main characters. Harry, whose perspective is changing towards the Malfoys. And Draco, who represents the Malfoy family and all its associated traits and values.
There could also be new antagonists introduced, perhaps some old - fashioned wizards who oppose the idea of a girl being in the position of power or being the 'chosen one'. They might try to undermine Harry at every turn, not just because of her role in the prophecy but also because of her gender.
It could be a popular guy in school and a shy girl. The popular guy might think kissing the shy girl is just a bit of fun, but the shy girl is very sensitive and gets scared and cries.