Currently, there are 19 posts tagged mtn_transformation, which I added a wiki for today:

"Male to null" transformation. When a male character had a penis, but underwent a transformation that resulted in him having a featureless_crotch.

See also

• nullification

There are two other *tn_transformation tags (no wikis): gtn_transformation (5 posts) and atn_transformation (1 post)

There's also a nullo_transformation tag (9 posts), which apparently requires a urethra:

The act of transforming a character into a nullo via fantastical means where the character is left with a urethra

And finally there's nullification:

Nullification is the process of removing the genitals (penis, testicles, vagina, etc).
The character is occasionally left with a urethra and anus, for the sake of waste removal (and potentially sex).

Notes

• For tagging purposes, an intersex character may have this done on either or both sets of genitals.
• Not to be confused with featureless_crotch. Nullification implies that the genitals were present and therefore removed, even if not explicitly pictured.
• Not to be tagged with ambiguous_gender.

See also:

• nullo - A character with both their extenal (and sometimes internal) genitalia removed.
• nullification - The process of removing genitalia.
• castration - The gory process of removing the testicles. ("neutering")
• eunuch - A character that has had their testicles removed ("neutered").
• penectomy - The gory process of removing the penis.
• penectomized - A character that has had their penis removed.
• featureless_crotch - A character with no evidence of genitals having ever been present.
• nullvember - A 'celebration' of nullos and nullification during the month of November.

Any thoughts on what to do with this mess? Perhaps mtn_transformation/gtn_transormation/atn_transformation should all be aliased to (or imply?) a generalized null_transformation tag, which could then imply nullification and maybe featureless_crotch and transformation? Though, there's a good chance of these getting tagged on things like "a magical eraser erases a characters genitals", which I'm not sure is really transformation, and if it's mid-transformation, the genitals might not be fully removed yet. Also, the definition of nullification is rather contentious (topic #32582). I'm not even mentioning null, since that tag is so contentious...

I don't see a purpose in *tn_transformation tags. It'd be the same messy situation that we have rn with [gender]_on_[bodytype] tags like male_on_anthro.
In fact, this is essentially just that, but as a transformation tag.

Null isn't a sex like male/female/intersex, it's a description of the genitals. They're still that original sex (aside from cases of gender transformation that accompany the nullification]].
It's not really a gender identity either. Maybe nullgender (a synonym/derivative of agender), but aside from that identity is rarely tagged aside from lore tags like trans_(lore). If anything, it would fall under nonbinary_(lore) if the nullification process clearly influences their gender identity

crocogator said:
imply [...] maybe featureless_crotch

Definitely not. Nullifications do not always result in featureless crotches. As the wiki says: The character is occasionally left with a urethra. (for example: post #2900369)

dirtyderg said:
I don't see a purpose in *tn_transformation tags. It'd be the same messy situation that we have rn with [gender]_on_[bodytype] tags like male_on_anthro.
In fact, this is essentially just that, but as a transformation tag.

That's why I suggested aliasing to null_transformation to avoid tag bloat, but if that's still too much tag bloat, aliasing to nullification is also an option. Though nullification can also be used for gory surgical removal stuff (penectomy + castration), which is quite different.

I just realized ntm_transformation has also been tagged a few (6) times, but I'm not sure it can be nicely aliased away, so it might not be worth worrying about.

Also, somewhat off-topic: if nullo means a character that has underwent castration and a penectomy and is left with a urethra, maybe we should rename it penectomized_nullo, or something? The current tag name is problematic to say the least... This, of course, would require aliasing nullo -> nullo_(disambiguation).

crocogator said:
That's why I suggested aliasing to null_transformation to avoid tag bloat, but if that's still too much tag bloat, aliasing to nullification is also an option. Though nullification can also be used for gory surgical removal stuff (penectomy + castration), which is quite different.

I wasn't disagreeing, just putting my opinion on things. I just forgot to mention that I think null_transformation would work just fine.

I just realized ntm_transformation has also been tagged a few (6) times, but I'm not sure it can be nicely aliased away, so it might not be worth worrying about.

Something like that would be more attributed to penis_growth (or the proposed penis_sprouting tag, read topic #44283 for more).

Also, somewhat off-topic: if nullo means a character that has underwent castration and a penectomy and is left with a urethra, maybe we should rename it penectomized_nullo, or something? The current tag name is problematic to say the least... This, of course, would require aliasing nullo -> nullo_(disambiguation).

It might be useful but generally you can get the same results by searching'nullo -featureless_crotch' and non-gory/surgical nullification through 'nullo featureless_crotch'

The bulk update request #9082 is pending approval.

create implication null_transformation (0) -> nullification (239)
create alias mtn_transformation (19) -> null_transformation (0)
create alias ftn_transformation (0) -> null_transformation (0)
create alias atn_transformation (1) -> null_transformation (0)
create alias gtn_transformation (5) -> null_transformation (0)
create alias itn_transformation (0) -> null_transformation (0)
create alias htn_transformation (0) -> null_transformation (0)
create alias nullo_transformation (9) -> null_transformation (0)
create alias ntm_transformation (5) -> penis_growth (1587)

Reason: topic #45935

Not sure which tags would work best for other Nt*_transformation tags.

Edit: Typos

dirtyderg said:
The bulk update request #9082 is pending approval.

create implication null_transformation (0) -> nullification (239)
create alias mtn_transformation (19) -> null_transformation (0)
create alias ftn_transformation (0) -> null_transformation (0)
create alias atn_transformation (1) -> null_transformation (0)
create alias gtn_transformation (5) -> null_transformation (0)
create alias itn_transformation (0) -> null_transformation (0)
create alias htn_transformation (0) -> null_transformation (0)
create alias nullo_transformation (9) -> null_transformation (0)
create alias ntm_transformation (5) -> penis_growth (1587)

Reason: topic #45935

Not sure which tags would work best for other Nt*_transformation tags.

Edit: Typos

Yep, that looks right! I added featureless_crotch to the posts currently tagged ntm_transformation, so that type of content is still searchable. There might be some technical issues with ntm_transformation -> penis_growth (if mid transformation, only balls have "grown" so far. Also, whatever the heck post #2967843 is), but these are edge cases for an obscure tag I don't really expect people to be using anyways, so I'm not super concerned about it.

I've gone ahead and rewritten the wiki to match up more with other null tag wikis in terms of formatting.

crocogator said:
whatever the heck post #2967843 is

That looks like attaching a detachable penis. Moreso body_modification than any sort of transformation so I've removed such tags. They won't be affected by the BUR.

dirtyderg said:
create implication null_transformation (0) -> nullification (209)

Kinda wary on this one. Tags like furrification are for non-anthro characters (or people) simply depicted as an anthro, expressly not as a result of transformation. Having nullification be for non-null characters transformed into a null character could end up creating more confusion and more mistags with similar tags.