>>36107161TL;DR TL;DR Excludes are your friend.
TL;DR it's possible for OC, may be possible for characters that aren't "just add water" tags like Marine, and will require autism and/or inpainting and/or RNG for said characters if at all possible.
What
>>36107403 said. I looked for a few minutes and this was the only image I could find that remotely resembles what you're describing
https://danbooru.donmai.us/posts/5450843?q=order%3Ascore+long_hair+side_ponytail+rating%3Ageneral+I think Danbooru rolled back the "free 6 tag searches for everyone", so you'll probably have to search using
https://danbooru.donmai.us/posts?page=1&tags=long_hair+side_ponytail or any other 2 tag combination that you think might help find an example or even something to try and use with img2img if grug tagging gets you nowhere...
I managed to get fairly close with:
masterpiece, best quality, 1girl, one side up, hime cut, side ponytail, sidelocks - and NAI default excludes + twintails, pigtails after a few rolls on the default k_euler_a 28 steps 11 scale. You aren't going to get very far once a character that already has a "strongly defined" hairstyle or tag in general is introduced to the proompt without "exclude engineering". Two examples with marine and varying {{{brackets}}} on the same seed if you want to check full proompt info:
https://litter.catbox.moe/5es7p6.pnghttps://litter.catbox.moe/rj5j07.pngIf you're serious about trying to -tism this result repeatedly, you might want to try adding various "short hair" style tags to your excludes:
https://danbooru.donmai.us/wiki_pages/tag_group%3Ahair_styles#dtext-short and then maybe try hime cut + side ponytail + short ponytail + sidelocks? Putting "long hair" or "very long hair" in automatically seems to apply it to the ponytail. Try and "think like it's thinking" - what do most "side_ponytail long_hair" on the top-rated images
what it likely was trained on, so "order:score side_ponytail" would be a good Danbooru search look like? A long ass side ponytail...