Well, from what we can expect in a family - centered series like this, the Tillerman family members are the key characters. There may be an older sibling who is kind of a role model for the younger ones, showing them how to face difficulties. Then there could be a younger child who is full of curiosity and innocence, often getting into little adventures that end up teaching the whole family something. And don't forget any extended family members who might pop in and out of the story, adding more layers to the family dynamics.
One main theme could be family bonds. The Tillerman family likely experiences various challenges that test and strengthen their family relationships. Another theme might be self - discovery, as individual family members grow and learn about themselves throughout the series. Also, resilience could be a theme, showing how they face difficulties and keep going.
Hari Seldon is really important. He's the one who developed psychohistory.
Tris Prior is extremely important. She is the main character, a Divergent who challenges the faction system. Four is also significant. He is Tris's love interest and an instructor. His real name is Tobias Eaton, and he has his own struggles within the faction system.
Elric himself is of course the most important character. He is a complex anti - hero. Then there's Cymoril, who has a deep relationship with Elric. Also, Stormbringer, which is not exactly a character in the traditional sense but more like a powerful, sentient weapon that is crucial to the story.
Lyra is a very important character. She is a brave and curious girl who embarks on a great adventure across different worlds. Will is also crucial. He comes from our world and gets involved in the complex events of the parallel universes. Then there is Lord Asriel, Lyra's father. He is a powerful and somewhat controversial figure, often fighting against the Magisterium.
In addition to Lisbeth and Mikael, there's Erika Berger. She's an important figure in the world of journalism in the novels. She has her own professional and personal struggles and her relationship with Mikael adds an interesting dynamic to the story. Then there's Alexander Zalachenko, a key figure in the web of corruption and secrets that the story revolves around.
Obviously, Dortmunder is the most important character. He's the mastermind behind most of the capers. There are also his cohorts like Kelp, who often helps out in the heists with his own unique skills.
Batman and the Joker are of course the most important. But also, Batman's allies like Robin, Batgirl, and Alfred are important as they are the ones the Joker targets.
As I don't know the Rodriguez family story, I can't name the important characters.
As I don't know the details of 'the brannock family story', it could be the parents as they are often important in family stories. They might be the ones guiding the family and making important decisions.