Czech's weird rhotic "/r_r/" was surprisingly common for a sound which nobody's sure what it really is.
Consonants at pretty much every POA are common, except:
- Only doctrellor used any labial-velars (/k_p g_b N_m/). In the real world they're fairly common.
- Only tengado used the epiglottal stop />\/, and only CGreathouse had an epiglottal fricative /H\/.
- Only kodé used linguolabials (/t_N d_N T_N/). They're found in some languages of Vanuatu, and apparently developed out of original bilabials when followed by a front vowel. And they're fairly easy to pronounce, so I wonder why more people haven't used them.
- Only JohnQPublik used a bidental fricative.
- Only Curlyjimsam used that Swedish fricative /x\/. But it's thought by some that that one might not actually exist. (Why not? I don't know. Ask them.)
- Only FSI used a non-high semivowel (/e_^/).
- Nobody used any labial-alveolars (/t_p d_b n_m/) or labial-postalveolars (/t_-_p d_-_b n_-_m/). Yeli Dnye of PNG contrasts both with labial-velars.
- Unsuprisingly, nobody used epiglotto-pharyngeals (made by putting the epiglottis on the pharynx), which are only known from one language, Ami of Taiwan.
- One can't really tell when someone reports having /t_d/ whether they mean their /t/s are pronounced like in Romance languages, or whether they contrast /t_d/ and /t/. But I will say that contrasting dentals and alveolars is cool, well-attested and you should do it.
- Nobody used velarization on anything other than /5/.
- Only Zhen Lin (/p_p\/) and Anguipes (/b_v/) had labial affricates. This is, of course, attested in German.
- Only Anguipes had a dental affricate (/t_T/). Saanich, a North Straits Salish language, has /t_T_>/ (but not /t_T/).
- Only JohnQPublik used retroflex affricates (/t`_s` d`_z`/). These are reasonably common in the real world.
- Only Nuntar (/c_C J\_j\/) and JQP (/c_C_>/) used palatal affricates. These, too, are reasonably common, though I don't know how common contrasting them with /c J\/ is.
- Only cathbad (/k_x q_X/) and JQP (/k_x_> q_X_>/) used dorsal affricates. /k_x/ exists in dialects of German, and /q_X/ is common in Salishan and elsewhere.
- Several people used the voiceless alveolar affricate /t_K/, but only Nuntar used the voiced version /d_K\/, and only chris_notts used the ejective /t_K_>/. I think in the real world the ejective might actually be more common, since I know several language that have /t_K_>/ but not /t_K/.
- Nobody used any non-alveolar lateral affricates! Dahalo has a palatal ejective /c_L_>/, and Zulu has a velar ejective /k_L\_>/. Now these are cool sounds.
- Similarly, non-alveolar lateral fricatives were missing. Plenty of approximants, but only Primordial_Soup used a palatal fricative /L_0_r/, and nobody used the velar. EDIT: It turns out /C\/ is Z-SAMPA for /L_0_r/. So add JhemethaEqiv and Mr Saturday.
- Two bilabial approximants /B_o/ (Zhen Lin and Nuntar), two unrounded velars /M\/ (JQP and Kuvdamos), one uvular /R_o/ (Dingbats).
- Only Primordial Soup and kodé used the bilabial trill /B\/, and neither of them seems to have paired it with /t/ as /t_B\/ like Oro Win does.
- Only Curlyjimsam used the retroflex flap /r`/.
- Only Pie Man used the labiodental nasal /F/, but that's okay since I don't know of any languages that actually use it.
- Nobody used bilabial or labiodental flaps.
- Nobody used /h~/. Rhinoglottophilia FTW!
- Only cathbad and Pechel tefalla made use of nasal released stops / prestopped nasals.
- Only Nuntar and Wycoval used /K\/, and nobody used voiced lateral fricatives at any other POA.
- Only Arunas and Radagast used the "voiced aspirates" / breathy voiced stops.
- Only Varamannato and Pechel tefalla had a voiceless flap /4_0/, and nobody had any voiceless trills.
- Only Arunas and pfainuk used any clicks. And of course Eddy, who didn't bother to participate.
- Only Radagast used the "velar aspiration" found in Lakhota.
- Nobody used trill-released stops. (i.e. /tr/ as a single phoneme)
- Only Finlay used a reverse affricate (/s_t/). I've never heard of a natlang using them but they sound kind of cool.
- Nobody used non-explosive stops (i.e. stops without a pressure build-up and release). Which is fair enough, though, since I only just heard of them myself. Ikwere developed them out of /k_p g_b/.
- Nobody used voiceless implosives.
Corrections/additions welcome.