Please add the possibility to copy the result of the transform to Latex/MATHML/LibreOffice of the selected char to clipboard. Reproducible: Always
Do you know of a machine-readable mapping between the different representations? Also, does LaTeX handle Unicode? Some years ago, only some selected characters were available. http://tex.stackexchange.com/questions/34604/entering-unicode-characters-in-latex recommends to use XeTeX or LuaTeX. Regarding MathML, the last line already displays the "&#XXX;" XML entity representation, which you can copy and paste.
http://tex.stackexchange.com/questions/9790/mapping-from-unicode-character-to-latex-symbol-for-bibtex has some useful links, especially this unicode.xml file from W3C: http://www.w3.org/Math/characters/unicode.xml