About the sin sack tag
sin sack is a character tag that NovelAI Diffusion can use. On Danbooru it has 609 posts, and its best-rated still image scores 649. The samples above put the tag at the front of a fixed base prompt with seed 1234, so the differences between tags come from the tag alone.
How each model draws sin sack
Follows composition and expression instructions closely, so the effect shows in a tidy form.
Reacts to the tag more strongly, so its effect is easier to see.
WAI illustrious SDXL v17, a local model. Shows how the same tag reads outside NovelAI.
Writing sin sack in a prompt
Put the subject first, then this tag, then quality tags.
sin sack, solo, best quality, masterpiecewlop, sin sack, soloThe negative prompt and the full settings are on the terms page.
How these samples were made
Every image uses 832×1216, seed 1234, 23 steps and the k_euler_ancestral sampler. The base prompt and negative prompt stay the same for every tag, and only the tag under test changes. Images flagged by the NSFW check are regenerated with a new seed or hidden.
From the Danbooru wiki
The Sin Sack is a faceless male mob character originated from Touhou fandom. They wear a sack over their head marked with the character 罪 (Tsumi, or "Sin"). As a result, they are referred to as 罪袋/Tsumi-fukuro, which literally means "sin bag" or "sin sack".
They are frequently depicted as perverted followers of various female characters. In recent times, they are most commonly seen on various NSFW MMD videos (particularly those from the Iwara.tv website), where they are used as a generic male mob characters.
FAQ
Does NovelAI recognize sin sack?
Compare the samples on this page. Every tag on this site shares the same seed and base prompt, so any change you see comes from sin sack.
How do I write sin sack in a prompt?
Write "sin sack" near the front of the prompt and separate it from other tags with commas.
Should I use V5 or V4.5?
V4.5 shows the tag's effect more strongly. V5 gives steadier images with fewer artifacts.