This is Serina Leaf from Conception II.

Her base prompt:

c2s3rn4, green eyes, long hair, blue hair, side braid, mature female, medium breasts,

There's also 3d samples in the dataset if you're curious to try.

Her outfit:

school uniform, long sleeves, shoes, blue necktie, zettai ryouiki, butterfly hair ornament, pleated skirt, black thighhighs,

Her battle outfit:

mechanical tail, blue thighhighs, long sleeves, blue battle dress, puffy sleeves, skirt, frills, maid headdress, boots, bow,

Her swimsuit outfit:

swimsuit, green bikini, navel, bikini skirt, midriff,