8 =N ₦ #XXX =n for consistency?
17 3: … # opposite of ⋮ (more logical would be to swap with .3 ⋯)
21 .1 ․ # obvious location, even though ‥ and … are at inconsistent .. and 3:
23 <3 ♥ # easy alias to trigraph cH-
24 :) ☺ # easy alias to 0u
29 # obvious line drawing gaps
33 dd ╷ # goddamn! stupid arabic dad got there first
42 2- ╌ # exactly like to 3 and 4
46 BF ╳ # FD and BD combined; FB already in use
50 HW Ƕ # HV conflicts with vh line drawing
54 # old/middle english (uncommon)
55 #WY Ƿ # replaced by UU, later W
58 #Gy ȝ # do not use yy to keep y column clear
60 eS Ʃ # ES already in use
61 es ʃ # can't use sh; s1 would be another option
65 !C ǀ # corresponding zulu letter
66 !Q ǃ # idem; !. would be much more intuitive (previously ʗ)
67 !X ǁ # idem; or !/ (previously ʖ)
68 !A ǂ # Alveolar; !- looks alike, != even more so but already occupied
71 # expected but missing
74 #A0 Ǻ # normal A-ring already provided by AA
85 #ac ℀ # prefer common A-smallCap
87 cu ℆ # co ís present though
101 l- ƚ # not really a macron, but wouldn't really make sense anyway otherwise
113 # middle tilde #XXX: not tilde above
118 ##n? ᵰ # already a tilde above
126 # not used all that much, better leave x) free
133 #I) Ȋ # )I exists, but should not confuse
143 # usage is similar to inverted breve, just as rare
166 #D2 Ɗ # in use by control char
173 f2 ƒ # looks like a cedilla
184 #P2 Ƥ # in use by control char
199 Y; Ƴ # not a hook below, but Y2 hook above is already present
201 Z2 Ȥ # looks like a cedilla
205 # curls (9 is mostly free because horns are so rare)
208 j9 ʝ # crossed-tail actually
218 #2/ ƻ # rarely used, and double dash is far more logical
226 # turned/inverted (trailing I is uncommon for lowercase, and already used thusly for !I, ?I and NI)
229 #EI Ǝ # would be confusing, as it's not uppercase schwa eI
230 eI ə # schwa, not turned E (latter is very uncommon)
239 #nI ᴎ # reversed capital N, but NI already in use
241 #RI ᴚ # conflicts with RI control char
249 oE ɶ # Oe also available, but E looks capital
251 Ap ɒ #XXX Ao? (AO in use)
264 Op ɤ #XXX oy would look alike
268 #lp ɬ #XXX: lb for 'belt'
278 mL ɰ # like rL (XXX mp?)
280 # small caps (also possible at *s)
289 # more from phonetics extensions
305 # ipa releases (ⁿ already present as nS)
311 # note: common meaning
313 " Double acute accent
336 % Greek/Cyrillic special
337 + smalls: Arabic, capitals: Hebrew
338 3 some Latin/Greek/Cyrillic letters
343 # hangeul consonants at *J
365 # hangeul vowels at *J
384 # hangeul iotized vowels at *K