This is about bow hairband(a.k.a. bunny hairband), which is a hairband with bow like a rabbit.
You can color your character's hairband with (colored) hairband prompt. like red hairband, green hairband, etc...
Prompt : bow hairband
SD 1.5 ver : https://civitai.com/models/1046182/bow-hairband
Trained by 1000 images of bow hairband girls, for example...
Bea (Pokemon)
May (Pokemon)
Arona (Blue archive)
Reisalin Stout
Kagamine Rin
Amber (genshin impact)
Kizuna Ai
Minato Aqua (sailor casual outfit)
Oozora Subaru (swimsuit outfit)