Niko is the playable protagonist of OneShot. They are a child with blue hair with three "whiskers" jutting out from the sides, yellow catlike eyes, and tan skin. They wear a brown overcoat extending over their arms, a long light blue scarf, a brown hat with catlike ears, and grayish-purple bottoms that appear to be leggings. 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.

In Oneshot: World Machine Edition, Niko's bio reads:

"The erstwhile protagonist and unfortunate victim of the forces set in motion by The World Machine. A bright-eyed child with a curious heart, Niko was summoned to play the role of the Sun-Bearer and Messiah to a broken world.

Now that the machine has been healed and the cycle broken, Niko is finally free to return to their home. Niko can once again chase through golden fields of wheat under a warm sky, taste fluffy and syrupy pancakes, and most importantly: hug the mom that they've missed so much.

Thank you."
Niko is a very kind and caring kid. Being the messiah that the prophecy had foretold, they became determined to reach the Tower and bring the sun back to it in order to save the World, even despite various other people stating that the sun won't stop the World from dying. Niko is also helpful, which is shown when they repair the Rowbot at the dock in the Barrens, and volunteer to find Alula and return her to Calamus in the Glen.

Upon reaching the Refuge, they begin to express indecisiveness, as seen where they have trouble choosing whether to bring back the World's sun but lose their only chance to return home, or to shatter the lightbulb, destroying the World instantly and have them return home. Niko also tends to be curious. They often turn to the Player to ask questions, most of them regarding information about the Player.