nsfw, safe, video - these appear in the top of tags on any booru.plus booru regardless of content. Not visible in metadata field. safe and nsfw apply depending on whether you checked the flag or not, video applies automatically to actual video files and animated gifs.
audio - unusable and will break your changes if you try it
3d - only used for fanmade models and posings (SFM, MMD, Gmod). I think using it for official renders and screencaps is redundant.
3d_variants - games with 3D gameplay.
absurdres (borrowed tag) - images over 3200x2400 resolution
correct_artist_name_in_source - due to technical reasons, some artist names can't be put the way they are and/or will break your changes if you try.
fan-revived - online-only games that were shut down but can be played again thanks to the fans' efforts. These are Online Worms and Worms World Party Aqua.
g1, g2, g3, g4 - generations of games (see the Worms Wiki). May be used for fanwork.
gif - while static images can be in this format, this is only used for animations to avoid confusion
interfranchise_crossover - crossover between 2 or more versions of Worms.
jaggy_lines (borrowed tag) - lines which are meant to be pixelated, like in old MS Paint art.
lgbtq - same-sex romance, pride flags and other imagery that's not cishet. Don't use lgbt+, it doesn't work
lost_media - games and media that are unacessible or were never released. Worms: Battle Rally was cancelled mid-development, Worms: Crawl of Duty was apparently pitched but no publisher was interested, the Facebook game was shut down. The promotional W4M Flash dress-up game wasn't preserved and only a few screenshots are left. WWP had a port planned for Gizmondo - a console the company of which went bankrupt.
lowres (borrowed tag) - images under 500x500 resolution
nose - worms in G1 art and some G2 covers have those. Also human_nose for the 2nd case.
official - drawings and renders by Team17, whether they actually were used in some way or not. Not to be used for edits.
render - any 3D imagery that's been rendered so it looks neater, not just screenshotted with pixelated edges and stuff like that. Used for both official and fanmade artwork.
segmented_body - feature of G1 worms or artistic license. Only used for fan creations, putting it on any official artwork seems redundant.
sharp_teeth - feature of W.M.D worms or artistic license. Only used for fan creations, putting it on any official artwork seems redundant.
sigworm - worm characters created by Team17 forum members. Art of those can go back to the mid 2000's.
weapon - doesn't apply to animals, old women and some items if they're not treated as a weapon in the context of the image
website_watermark - clean pictures are generally preferred over those with site watermarks.
worms_mayhem - content related to W4M and/or WUM
wormified - character or person reimagined as a worm
worms - ambiguous, not used
wormsona - worm equivalent of fursona
Subjective tags that shouldn't be used: creepy, cute, cursed, wholesome, etc.
