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Shimoe Koharu (Blue Archive)

下江コハル (ブルーアーカイブ) / 시모에 코하루 (블루 아카이브) / 下江小春 (碧蓝档案)

Note: this is an older LoRA that I recently retrained. I think the quality of the captions is lacking and as such this LoRA doesn't perform quite as well as it should. I'll re-tag the dataset when I have time.

Download here.

Table of Contents

Preview

Koharu portrait Koharu preview Koharu preview 2

Usage

Use any or all of the following tags to summon Koharu: koharu, 1girl, halo, pink eyes, pink hair, head wings, low wings, twintails, blue archive

  • Hair and eye tags are optional but may help strenghten the effect.
  • The tag ringed eyes was used in images where her unique eye design was very prominent.
  • The vertical line should appear automatically, but may not always reach past her chest because artists are inconsistent in how they draw it. You can try to describe it literally: vertical black line running past navel or whatever. Don't try tattoo unless you want womb tattoos.

For her normal Trinity outfit: school uniform, black shirt, off shoulder, hat, beret, bra strap, skirt

It does a decent, but not perfect job with her eyes. Adding some combination of embarrassed, open mouth, swirly eyes with varying degrees of emphasis can draw out her characteristic horny retard look.

I tried to add the slit pupils expression and the model sorta gets it, but not very well. You can prompt it with slit pupils and flustered but it generally creates abominations.

Some of her swimsuits are in the training data, too.

Training

Exact parameters are provided in the accompanying JSON files.

  • Trained on a set of 183 images; 170 normal, 13 slit pupils/flustered.
    • 4 repeats for normal
    • 5 repeats for flustered expression outfit
    • 3 batch size, 7 epochs
    • (170*4 + 13*5) / 3 * 7 = 1739 steps
  • 0.078 loss
  • 832x832 training resolution
  • constant_with_warmup scheduler
  • Initially tagged using scraped Danbooru tags, then heavily edited.
    • Removed many shit/inaccurate tags
    • Made sure important traits were present and consitently described, and traits like halo were consistent with actual visibility
    • Pruned lots of redundant tags and simplified outfits. There is no black serafuku, long sleeves, only Koharu's school uniform.
    • Added camera angles and image composition hints
    • Added facial expressions (particularly embarrassed) and unusual pupils when present
  • Used network_dimension 128 (same as usual) / network alpha 128 (default)
  • Trained without VAE.
  • Training dataset available here.

Revisions

  • v3 (2023-02-11)
    • Re-trained with more recent parameters. No changes to dataset.
    • Still overfit to her standard outfit. Needs re-tagging.
  • v2 (2023-01-15)