In 'Twilight', Bella Swan and Edward Cullen are the main characters. Bella, as a human, is constantly in a position of having to understand and sometimes 'care' for Edward. Edward, being a vampire, has his own vulnerabilities and Bella has to deal with them, especially when it comes to his family and the vampire society they are part of.
In 'The Vampire Diaries', Elena Gilbert is a key character. She is a normal teen who gets involved with vampires like Stefan and Damon. Stefan, in particular, often plays a role of a caretaker in some sense as he tries to protect Elena from the darker aspects of the vampire world. Damon, on the other hand, has his own complex relationship with Elena.
There is also 'Cirque Du Freak' which involves teen characters interacting with vampires. The main character, Darren Shan, gets involved with a vampire and has to navigate a world where he has to take care of himself and also deal with the vampire - related chaos. It's a dark and exciting series that combines elements of horror and coming - of - age stories.
The main character is probably the caretaker, but there could be other important characters too. For instance, if the story is set in an apartment building, there could be a nosy tenant who always complains to the caretaker. Or perhaps there's a friendly neighbor who helps the caretaker out from time to time. These characters could play significant roles in the development of the story.
Captain Kathryn Janeway is one of the main characters. She has to lead the Voyager crew through their unexpected journey. There's also Chakotay, who is important in terms of his leadership skills and cultural knowledge. Tom Paris and B'Elanna Torres are significant too, with Paris as the pilot and Torres being an engineer.
In the 'Alex Rider' series, the main character is Alex Rider, a 14 - year - old boy who gets recruited into the world of spying.
The main characters are Robin, who is the leader of the Teen Titans. Then there's Starfire, an alien princess with superpowers. Beast Boy, who can transform into different animals, is also a main character. Cyborg, half - human and half - machine, and Raven, with her dark and mysterious powers, are also important characters in the Teen Titans Graphic Novels.
In 'The Hardy Boys series', the main characters are Frank and Joe Hardy. They are brothers who are always getting into detective adventures. In 'Nancy Drew series', it's Nancy Drew herself. She is a fearless and intelligent girl detective who solves all kinds of mysteries.
In 'Bloodlines', the main character is a fledgling vampire. They have to navigate the complex vampire society in modern - day Los Angeles. Their journey is filled with challenges as they discover their new powers and deal with different vampire factions.
In the 'Vampire Kisses' series by Ellen Schreiber, Raven is a main character. She is a goth girl with a strong personality who is attracted to the vampire.
There could be an ancient vampire, wise and full of secrets, who acts as a mentor or a source of conflict. And then there are the enforcers or guards of the vampire mountain, who are strong and fierce, protecting the mountain and its inhabitants from outside threats as well as maintaining order within.
In 'Buffy the Vampire Slayer' novels, Buffy Summers is the main character. She is a young woman with superhuman strength and abilities who is destined to fight vampires. She has a group of friends who help her in her battles.