This is an Anemo Slime. Anemo Slimes are Common Enemies that are part of the Slimes enemy group and the Elemental Lifeforms family. They are small monsters created by the coalescing of Anemo dispersed throughout nature. They are able to float in the air to a certain degree due to the power of Anemo. This particular one however is more keen on acting cutesy and even cringeworthy, saying words like "uwu" a lot and simping for anything cute in regards to the Genshin verse.