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About the 621 (armored core vi) tag
621 (armored core vi) is a character tag that NovelAI Diffusion can use. On Danbooru it has 257 posts, and its best-rated still image scores 203. 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 621 (armored core vi)
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 621 (armored core vi) in a prompt
Put the subject first, then this tag, then quality tags.
621 (armored core vi), solo, best quality, masterpiecewlop, 621 (armored core vi), 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
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The protagonist of Armored Core VI: Fires Of Rubicon. They are a fourth-generation augmented human, designation C4-621. They were left "brain-fried" under mysterious circumstances before being sent to Rubicon III by Handler Walter, ostensibly to secure the planet's valuable Coral and earn the pay necessary for restorative surgery.
As they make an illegal entry to the planet, they find a wreckage of Nightfall at Walter's guide, gaining access to ALLMIND system by stolen Raven's license.
As an Armored Core character, they were never depicted directly in canon - usually in their Armored Core (starting with Loader 4), or as a completely-bandaged figure seen at the end of the story trailer.
Notable depiction in fanarts includes them animalized as a dog, as they are a "hound" of Handler Walter.
FAQ
Does NovelAI recognize 621 (armored core vi)?
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 621 (armored core vi).
How do I write 621 (armored core vi) in a prompt?
Write "621 (armored core vi)" 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.