In reply to New characters in the last several years:
Only a very rough record:
LATIN
Considerable additions were made, especially for scientific usage. E.g:
• five new, 1E9B to 1E9F (among: ẞ)
• Latin Ext. C
• Latin Ext. D
• u10190 block, Roman numerals
• Monetaria: 4 new, 20B6 to 20B9
• 1DC0 block
CYRILLIC
• several new ch.s in the 0500 block
• new Ext. block A640
• new comb. diacritics block 2DE0
GREEK
nothing new (as far as I’m aware of)
