It's just so bewildering when on one hand lowercase superscript is missing exactly one letter for the full coverage, and at the same time Unicode has characters like "Grinning cat face with smiling eyes"(U+1F638). Just what I needed.
It's a bit disappointing because together with the integration in the REPL this feature in Julia works well enough to give a glimpse of the potential but when trying to experiment more it shows gaps that make it a bit of a trial-and-error situation. Better direct support in standardized encodings could make this much more usable and maybe not just in one specific language.