It would be nice to have a single page to discuss changes relating to all the Unicode chart templates. I agree that consistency is important  it was consistent before JPaestpreornJeolhlna changed the casing of "reserved" and "control" to "Reserved" and "Control", and it is consistent now that the changes have been made to all (?) the templates.  The question is which capitalization is best.  It was me who originally added the character names and "reserved", "control" and "not a character" annotations to the templates, taken from the Unicode Character Data file where character names are all upper case and "reserved", "control" and "not a character" are all lower case. However, I don't see any reason not to capitalize "reserved", "control" and "not a character" to "Reserved", "Control" and "Not a character" on Wikipedia when used as titles.  You could also make a case for capitalizing character names rather than using all upper case (e.g. "Latin Capital Letter A" or "Latin capital letter A" instead of "LATIN CAPITAL LETTER A", but in very many cases it would be problematic to decide which words to capitalize and which not, so I would prefer to stick with all upper case character names.