Examples of truly unique conlang features?

[Nortaneous]

Are there any natlangs that conjugate verbs for aspect, mood, and voice, but not at all for person, number, gender, and tense?

Piraha conjugates verbs for aspect, mood, evidentiality, and tense, but not at all for person, number, gender, and voice. That's close enough that there's probably one that does what you're asking about, but I don't know what it is.

(Also, I looked up Rotokas because I remembered its verb system being bizarre, and it has 15 different tense affixes.)

As for your earlier post: 1) happens in my conlang Miar, but I'm not sure where I got it from. Participles aren't necessary; you could probably handle them with serial verb constructions.

[gach]

Mongolian has morphologically marked TAM and voice categories but lacks person/number marking on verbs if you don't count the fact that different imperative like moods only apply to certain implied persons. This isn't the case for all Mongolic languages since often the agglutination of subject pronouns has created new person suffixes.

[Zhen Lin]

Are there any natlangs that conjugate verbs for aspect, mood, and voice, but not at all for person, number, gender, and tense?

Japanese verbs conjugate for tense (past / non-past), mood (indicative, negative, imperative, conditional, hortative), and voice (active, passive, potential, causative, passive-causative), but not person, number, or gender. (Aspect is expressed with auxiliary verbs.)

[Hallow XIII]

So does Korean. And Manchu. It's an West East Altaic Sprachbund feature.

[jal]

Reading through my Kotanian grammar pages, I found another thing I haven't seen in conlangs or natlangs (but admittedly I don't know that many natlangs nor conlangs), is that Kotanian has, for a limited number of graded antonyms, a neutral adjective expressing the quality. So theres "young" and "old", but also "of a certain age". These neutral adjectives are especially used in comparison.


JAL

[WeepingElf]

So does Korean. And Manchu. It's a West Altaic Sprachbund feature.

You mean "East Altaic"? West is where the Sun goes down. Turkic has personal endings.

[Hallow XIII]

So does Korean. And Manchu. It's a West Altaic Sprachbund feature.

You mean "East Altaic"?

Yes.

[2+3 clusivity]

Shit demon speech? As in, large swathes of the conlang.