This is the reason I started trying to make LORA's. The anime may not have been for everyone, but it's been my favorite since I first saw it.
It was trained on about 275 images taken directly from series stills focusing on many of the main characters and a few of the supporting characters also. With that large pool of images it has a habit of leaning towards the same style as the anime but with some work it's still quite versatile.
Sometimes needs helper prompts to correct hair color/length and eye color. Start without them and add if needed. Often needs (cat ears, fur) in negative prompt, most checkpoints think the Diclonious horns are ears.
The (Sweater) trigger is the one Mayu wears.
The (MaskedLucy) trigger does not work well. There were very few scenes to pull that look from, but I felt it necessary to at least try. Maybe you'll have better luck.
V9 - was the ninth time I attempted... it kinda worked and is workable... mostly.