Not necessarily. Whether or not all the characters 'endings were clearly explained in a novel depended on the plot and theme of the novel. If the plot of the novel is very complicated, it may be necessary to explain the ending of all the characters so that the readers can better understand the plot and the relationship between the characters. However, if the plot of the novel was relatively simple or the theme of the novel did not need to emphasize the ending of the characters, it might not be necessary to write the ending of all the characters. Some novels might only need to leave some clues for the reader to imagine the ending of the character during the development of the plot. Whether or not to explain the ending of all the characters clearly should be decided according to the plot and theme of the novel. If the plot of the novel is very complicated and requires the ending of all the characters to be clearly explained, then the plot should be written in as much detail as possible so that the readers can better understand the plot and the relationship between the characters.