9 =N ₦ #XXX =n for consistency?
19 <3 ♥ # easy alias to trigraph cH-
20 :) ☺ # easy alias to 0u
27 HW Ƕ # HV conflicts with vh line drawing
31 # old/middle english (uncommon)
32 #WY Ƿ # replaced by UU, later W
35 #Gy ȝ # do not use yy to keep y column clear
37 eS Ʃ # ES already in use
38 es ʃ # can't use sh; s1 would be another option
42 !C ǀ # corresponding zulu letter
43 !Q ǃ # idem; !. would be much more intuitive (previously ʗ)
44 !X ǁ # idem; or !/ (previously ʖ)
48 # expected but missing
51 #A0 Ǻ # normal A-ring already provided by AA
64 cu ℆ # co ís present though
77 l- ƚ # not really a macron, but wouldn't really make sense anyway otherwise
89 # middle tilde #XXX: not tilde above
94 ##n? ᵰ # already a tilde above
102 # not used all that much, better leave x) free
109 #I) Ȋ # )I exists, but should not confuse
119 # usage is similar to inverted breve, just as rare
142 #D2 Ɗ # in use by control char
149 f2 ƒ # looks like a cedilla
160 #P2 Ƥ # in use by control char
175 Y; Ƴ # not a hook below, but Y2 hook above is already present
177 Z2 Ȥ # looks like a cedilla
181 # curls (9 is mostly free because horns are so rare)
184 j9 ʝ # crossed-tail actually
202 # turned/inverted (trailing I is uncommon for lowercase, and already used thusly for !I, ?I and NI)
205 #EI Ǝ # would be confusing, as it's not uppercase schwa eI
206 eI ə # schwa, not turned E (latter is very uncommon)
215 #nI ᴎ # reversed capital N, but NI already in use
217 #RI ᴚ # conflicts with RI control char
225 oE ɶ # Oe also available, but E looks capital
227 Ap ɒ #XXX Ao? (AO in use)
240 Op ɤ #XXX oy would look alike
244 #lp ɬ #XXX: lb for 'belt'
254 mL ɰ # like rL (XXX mp?)
256 # small caps (also possible at *s)
266 # ipa releases (ⁿ already present as nS)
272 # note: common meaning
274 " Double acute accent
297 % Greek/Cyrillic special
298 + smalls: Arabic, capitals: Hebrew
299 3 some Latin/Greek/Cyrillic letters
304 # hangeul consonants at *J
326 # hangeul vowels at *J
345 # hangeul iotized vowels at *K