Perhaps later, as I took some break with SD recently. Have you maybe tried this lora: https://civitai.com/models/328830/project-sekai-hatsune-miku-colorful-stage-for-pony-diffusion-v6-xl ? In my limited tests I managed to get good enough Airi with prompt "momoi airi, project sekai, long hair, two side up, yellow ribbon", however I am aware, that quality would be better with more character focused lora.