The main characters in 'the little alien story' are probably the little alien itself. Since it's the focus, it's going to be involved in most of the story's events. There might also be a family of humans that the alien interacts with. For example, a little boy or girl who discovers the alien and helps it hide from the adults who might not understand. Another possible main character could be an old scientist who stumbles upon the alien and wants to study it, but also grows to care for it as a living being.
In the 'alien 3 original story', Ripley is the key character. She is the one who is constantly in conflict with the alien. Also, the inmates of the prison planet play important roles as they are affected by the presence of the alien and interact with Ripley.
In Alien 3's full story, Ripley is the most prominent character. But there are also the inmates on Fiorina 161. For example, Dillon, who is a leader among the inmates to some extent. And there's the prison warden, who has to deal with the chaos that the alien brings to his prison.
The alien is surely one of the main characters. There may also be humans who cross paths with the alien.
In the 'alien prometheus story', there are several important characters. Elizabeth Shaw, for example, is a strong - willed scientist. She's driven by her curiosity to understand the origin of life. Charlie Holloway is her partner in this exploration. And don't forget David, the android. He has his own motives and actions that greatly influence the events in the story. These characters interact with the strange alien world and each other, which drives the plot forward.
The main character is Amanda Ripley. She is the central figure driving the story forward as she searches for her mother.
Often, there's an intrepid explorer as one of the main characters. This person is brave enough to face the unknown alien world. There might also be a scientist character who is eager to study the aliens and their technology. Another common type is the military figure, who is there to protect the group from any potential threats from the aliens.
The main character is Ellen Ripley, who is well - known for her battles against the aliens. Alongside her, there are the prisoners in the prison planet. These prisoners include Dillon, who becomes an important figure in the fight against the alien. They all contribute to the story's development, with Ripley leading the charge against the alien threat while the prisoners bring in their own set of skills and attitudes, which range from fear and suspicion to courage and loyalty as the situation unfolds.
I don't have enough details about 'the little story' to say for sure, but it could be a child, a pet, or an old wise man.
It could be an alien protagonist. Maybe an alien who has been exiled from its own kind and is trying to find a new home. Or it could be a human scientist who is obsessed with studying aliens.
I'm not sure as I haven't read the specific 'alien isolation novel'. But it could be an astronaut who gets stranded and has to face the isolation and the aliens alone. Maybe a scientist who was studying something related to the aliens when things went wrong.