Niko is the playable protagonist of OneShot. They have blue hair, yellow catlike eyes, a blue scarf wrapped around a brown overcoat extending over their arms, a brown hat with catlike ears, and what appears to be tanned skin which sometimes looks black when in darker areas. They are tasked with returning the Sun to the Tower and saving the World from dying out.

Niko contacts the Player throughout most of the game when in need of help or simply conversation about Niko's and the Player's origins.

Niko is kind and caring. Being the messiah that the prophecy has foretold, they became determined to reach the Spire and bring the sun back to it in order to save the World, even despite what others say that the sun won't stop the World from dying. Niko is also helpful. A few instances of their helpfulness are seen in the game such as where they repair the rowbot at the dock part in the Barrens and volunteer to find Alula and return her to Calamus. Upon reaching the Refuge, they began to express indecisiveness, as seen where they have trouble choosing whether to bring back the World's sun but risk losing their only chance to return to their home world or whether to shatter the lightbulb, destroying the World instantly and for them to return to their home world. Niko also tends to be curious. They often turn to the Player to ask questions, most of them are regarding any information about the Player.