There are no special characters in text.

[binhnq94]

Following information in https://tw.wikipedia.org/wiki/Mmoa:Typing_Twi,

In the Twi - Language there are 2 Special-Characters , you need for writing some Twi-words

one special vowel is written Ɛ ɛ

example: Anaasε

one special vocal kou is written Ɔ ɔ

example: Nkכkככ , normaly written in english : Nkawkaw

But in https://www.openslr.org/129/, there are no special characters.
For example, the content in akuapem-twi/dev/EZR/EZR_001_Verse_001.txt:
"Persiahene Kores afe a edi kan no mu no nd Awurade nd kaa Kores koma ma kyer w saa dawub ns m yi de k ahemman no nyinaa mu maa Yeremia nk mhy no baa mu"
But no ɛ or ɔ in text.