The protagonist of Night Lights is the main character the player controls.
The protagonist has a large square-shaped head and small body. In light, it is shown to be blue, with black eyes closer to the bottom of the square head. The black eyes have white pupils, visible against the dark.
The protagonist is the only character present in Night Lights. The player controls it with the arrow keys. The protagonist is able to jump, but cannot withstand more than a single hit from hazardous spikes.
In many levels, the protagonist is able to evade hazards by shining on them with a light. This can be done by manipulating switches or using a lamp to create an aura of light around it, affecting the surrounding environment. At the end of the level, the protagonist must always reach the door for completion.