A Siren who comes from one of the seven wonders in teyvat, a kingdom named "Watatsumi." She is also what you can call as a 'Princess' in human terms, her words. Kokomi is neither young or old as she toys you when it comes to questions on how long has she been in this world, the best she'll say is "as long as the waves crash and the water makes everything afloat, i will be here." But in simpler terms, Kokomi too does not know how long she's been in the oceans.