With sufficient motivation the character wants something with relationship interaction. How the protagonist perceives and reacts in scene situations overall, is the theme relating to the plot. Include a leading protagonist near the first paragraph of each scene. In most fiction, point of view is kept to one POV per scene, each scene has tension. The POV is who the action is viewed through, and not knowing other characters thoughts will not express them accidentally. Keep the few points of view consistent as the story progresses, to engage the reader.
Relevant dialogue shows the character and uncovers information. Show what your characters experience in setting, action and dialogue rather than telling in narrative. Narrative can be effective showing the character with description before a confrontation. Dialogue moves the story faster, if important description of focus is added it slows the momentum. Read your story out loud to hear what is natural. Know your characters back story weaving a small amount with action. If back story is used the reader should care about the characters current situation. Decide the essential past before the novel began, leading up to why the character is sufficiently motivated.
Introduce the character with a few descriptive lines; then following less detail in dialogue, action or inner thoughts. Action and reaction moves the plot or characters in the most interesting way. Action and inner conflict can show character emotions, some back story may be used. From action to dialogue add enough plot related setting. With descriptive emotional thoughts of a scene about to take place, the scene is set for action. Reveal specific information to keep up the pace into confrontations and how they are resolved.
Conflict is added that is relevant to the plot and between characters, to increase the stakes. Emotion and suspense reveals characters moving their stories forward in the plot. Characters have differences one from another. Use voice dialogue and behavior rather than narrative summary to reveal character. Inner thoughts can give the reader views into desire, fear, motivation and challenges. Characters are developed with their personal perspective and why they do things.
Involve your protagonist in the plot undergoing tension, energy and momentum. Your protagonist is the one who engages through the emotional arc in the plot. Compel your protagonist to reconsider or change through story events. A protagonist may remain essentially the same, but grows or learns from actions or events in the story. Readers should always know what the character wants. A story ending expresses how the protagonist has changed or overcome.