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Code

Code (original)

Code (update for version 12.3)

Clear[LetterAt];
Options[LetterAt] = {FontFamily -> "Times", FontWeight -> Bold, FontSize -> 120};
LetterAt[letter_String, opts : OptionsPattern[]] :=  
  Block[{grm, grmr, mcoords, fontFamily, fontWeight, fontSize},
   fontFamily = OptionValue[FontFamily];
   fontWeight = OptionValue[FontWeight];
   fontSize = OptionValue[FontSize];
   grm = 
    Graphics[
     Text[
      Style[letter, FontFamily -> fontFamily, 
       FontWeight -> fontWeight, FontSize -> fontSize], {0, 0}], 
     ImageSize -> {100, 100}];
   grmr = Rasterize[grm];
   grmr = ImageReflect[grmr, Top -> Bottom];
   mcoords = Reverse /@ Position[ImageData[grmr], N@{0, 0, 0}]
 ];

Update : words in Cyrillic and Katakana

The line effect produces interesting results with more angular symbols.

Graphics[{Opacity[0.1], 
  Riffle[LetterCoordsToLines[#, 100, 700], RandomChoice@palette] & /@ 
   letterCoords}]

palette = ColorData[97, "ColorList"];
Graphics[{Opacity[0.1], 
  Riffle[LetterCoordsToLines[#, 100, 200], 
     Table[RandomChoice@palette, {Length[#] - 1}]] & /@ letterCoords, 
  Riffle[LetterCoordsToLines2[#, 100, 400], 
     Table[RandomChoice@palette, {Length[#] - 1}]] & /@ letterCoords},
  PlotRange -> {{-50, 650}, {-50, 150}}]

palette = ColorData[97, "ColorList"];
Graphics[{Opacity[0.1], 
  Riffle[LetterCoordsToLines[#, 100, 700], RandomChoice@palette] & /@ 
   letterCoords}]

Graphics[{Opacity[0.1], 
  Riffle[LetterCoordsToLines[#, 100, 200], 
     Table[RandomChoice@palette, {Length[#] - 1}]] & /@ letterCoords, 
  Riffle[LetterCoordsToLines2[#, 100, 400], 
     Table[RandomChoice@palette, {Length[#] - 1}]] & /@ letterCoords},
  PlotRange -> {{-50, 650}, {-50, 150}}]