There's an astronomer in 'Nightfall' who plays a crucial role. He's the one who discovers and tries to warn others about the coming nightfall. Another important character could be the religious leaders. They have a certain view of the world based on the constant light, and their reactions to the idea of nightfall are significant in the story.
Well, one popular type of character is the scientist - adventurer. These characters use their scientific knowledge to solve problems and uncover secrets. For example, Dr. Sarah in Isaac's works is constantly making new discoveries. There are also the rebel characters who fight against oppressive systems. They are often the ones who inspire change in the fictional universes. Another type is the artificial intelligence characters. Some are friendly helpers, while others turn out to be the antagonists due to glitches or malicious programming.
I'm not entirely sure as I haven't read the story lately. But typically in Asimov's works, the main characters are often intelligent, inquisitive individuals. In 'Youth', they might be young people with a thirst for knowledge or adventure.
In the Isaac story, there are several key characters. Isaac is at the center. His father Abraham is a major figure as he was the one who received the command to sacrifice Isaac. Sarah, Isaac's mother, is also important as she was part of the story of Isaac's birth. And Rebekah, Isaac's wife, is a main character too because she was brought into Isaac's life to continue his family line.
One memorable character is R. Daneel Olivaw from the Robot series. He is a robot with a highly developed sense of ethics and morality, often finding himself in situations where the Three Laws of Robotics are put to the test. His interactions with human characters, like Elijah Baley, are really interesting.
The main characters in this story are Isaac and his mother. Isaac is a young boy, innocent and vulnerable. His mother, on the other hand, is a complex character. She is deeply religious, but her religiousness takes a very extreme form. When she hears the so - called voice from God asking for Isaac's sacrifice, she is ready to go through with it. Their relationship and their actions form the core of the 'The Binding of Isaac Original Story'.
I'm not sure as there are many of his works that could potentially be considered a'school story'. But it could be students, teachers, or school administrators. Maybe a brilliant student who is the protagonist and faces various challenges in the school.
There were many famous sayings of Isaac Asimoff, and the most famous one was:
If there is a next life, I want to be a tree standing in a posture that will never be sad or happy.
This sentence came from Asimoff's book, Base, which expressed his yearning for the future and his reverence for life.
We can assume that Isaac in '600 lb life isaac's story' is a person whose life is being explored in the context of extreme obesity. He may be an ordinary person who, for various reasons such as poor diet, lack of exercise, or genetic factors, has reached a weight of 600 lbs or close to it. His story is likely to be about his day - to - day existence dealing with the consequences of his weight, his relationships with family and friends which are probably affected by his condition, and his pursuit of a healthier lifestyle.