Update (9-9-25): I added a style LoRA based on season 4 (Heroes). The art style for season 4 is different than the first three seasons and, in my opinion, not as good. Still, I'd been sitting on this dataset for months now, so I'm publishing what I've got. I may or may not do a V2 with a larger dataset, but it should work fine based on a couple of quick tests.
This LoRA is a bit experimental, but I still think it's neat! Initially, I was asked if I could do the underwear in the style of the High School DxD eyecatch screens. However, after making some changes, the model evolved into an official illustration style LoRA. This model was trained on the 80 eyecatch screens from the first three seasons (Heroes had a drastically different art style), as well as about 50 other high-quality illustrations made for the series.
➼Obligatory self-promotion: consider supporting or commissioning me at https://www.fiverr.com/metalchromex/make-you-a-stable-diffusion-anime-character-model or https://www.patreon.com/MetalChromeX so I can continue making cool crap for you all to enjoy for free!
Notes/tips for usage:
Keywords eyecatch and commercial break will help to more likely trigger the eyecatch/anime logo; the logo appears to randomly trigger, so you may need to try multiple times to get it.
Some characters are well known enough to Illustrious XL (like Rias and Akeno). I've also manually tagged characters; check the trigger word section for these.
If using a GUI, I recommend ADetail