Another theme might be isolation. At night, especially if it's very dark, a person can feel alone and cut off from the rest of the world. This sense of isolation can be a strong theme in the story.
A third theme could be discovery. In the midst of the dark dark night, the main character might discover something about themselves or about the world around them. It could be a new strength they didn't know they had, or a hidden truth about their environment that the cover of night reveals.
One possible theme is the power of nature. The dark and stormy night is a representation of nature's might and how it can affect the characters in the story. Mystery is also a likely theme. The darkness and the storm often shroud things in mystery, and the story might be about uncovering what lies beneath this veil. Additionally, the theme of change could be present. The storm could be a catalyst for change in the character's life or in the situation of the story.
Isolation could be a theme. A dark tale might be set in a desolate place or the characters might be isolated in some way, which adds to the overall sense of gloom. Also, the theme of loss can be present. This could be the loss of a loved one, of innocence, or of hope, all of which contribute to the darkness of the story. For example, in a story where a character has lost their family in a tragic event, it sets a very dark mood.
One possible theme could be fear. Since it's a dark night, the second - grader in the story might be afraid of the unknown.
Fear is a likely theme. The darkness of the room can symbolize the unknown which often induces fear in people.
Isolation could be a theme. In the dark, one can feel very alone. If it's a story about a person in a dark place, they might be cut off from others and have to deal with their situation by themselves. Also, survival can be a theme. If the 'in the dark' situation is dangerous, like in a dark cave full of hazards, the characters would be focused on surviving.
One possible theme is fear. The face in the dark is likely to evoke fear in the characters and the readers. Another theme could be the unknown. Since the face is in the dark, it represents something that is not fully known or understood.
One possible theme could be isolation. Kirby might be alone in a world filled with darkness, which emphasizes his struggle. Another theme could be redemption. If there are characters that have been corrupted, Kirby could try to redeem them.
One possible theme is hope. Just as the firefly's light pierces through the dark, it can represent hope in a difficult situation.
One possible theme could be hope. The spark represents a glimmer of hope in the darkness.
One possible theme could be mystery. If the roommate is acting strange or has secrets, mystery would be a big part of it.