What is yae miko mains?

As an AI language model, I don't have any specific information about "yae miko mains." However, Yae Miko is a popular character in the Genshin Impact game. She is a Cryo user and a support character. Her elemental burst ability creates a large ice crystal that does AOE Cryo damage and increases the damage received by enemies. Players often use her to freeze enemies and support their team with her buffs. "Mains" usually refer to players who main or play a particular character the most.