The following accented Latin letters:
Ǎǎ
Ǟǟ
Ǻǻ
Ȃȃ
Ȧȧ
Ǡǡ
Ḁḁ
Ȁȁ
Ḇḇ
Ḅḅ
ᵬ
Ḉḉ
Ḑḑ
Ḓḓ
Ḏḏ
Ḍ
ᵭ
Ḕḕ
Ḗḗ
Ḙḙ
Ḝḝ
Ȩȩ
Ḛḛ
Ȅȅ
Ȇ
ᵮ
Ǵǵ
Ǧ
Ḧḧ
Ḩḩ
Ḫḫ
Ȟȟ
Ḥ
ẖ
Ḯḯ
Ȋȋ
Ǐǐ
Ȉȉ
Ḭḭ
ǰ
ȷ
Ǩǩ
Ḳḳ
Ḵḵ
Ḻḻ
Ḽḽ
Ḷḷ
Ḹḹ
Ɫɫ
Ḿḿ
Ṃṃ
ᵯ
Ṅṅ
Ṇṇ
Ṋṋ
Ǹǹ
Ṉṉ
ᵰ
Ǭǭ
Ȭȭ
Ṍṍ
Ṏṏ
Ṑṑ
Ṓṓ
Ȏȏ
Ȫȫ
Ǒǒ
Ȯȯ
Ȱȱ
Ȍȍ
Ǫ
Ṕṕ
ᵱ
Ȓȓ
Ṙṙ
Ṝṝ
Ṟṟ
Ȑȑ
Ṛ
ᵳ
ᵲ
Ṥṥ
Ṧṧ
Ṣṣ
Ṩṩ
ᵴ
Ṱṱ
Ṯṯ
Ṭ
ẗ
ᵵ
Ṳṳ
Ṷṷ
Ṹṹ
Ṻṻ
Ǔǔ
Ǖǖ
Ǘǘ
Ǚǚ
Ǜǜ
Ṵṵ
Ȕȕ
Ȗ
Ṿṿ
Ṽṽ
Ẇẇ
Ẉẉ
ẘ
Ẍẍ
Ẋẋ
Ȳȳ
Ẏẏ
ẙ
Ẕẕ
Ẑẑ
ẓ
ᵶ
Ǯǯ
ẛ
Ꜿꜿ
Ǣǣ
Greek:
Ἀἀ
Ἁἁ
Ἂἂ
Ἃἃ
Ἄἄ
Ἅἅ
Ἆἆ
Ἇἇ
Ὰὰ
Ᾰᾰ
Ᾱᾱ
Άά
ᾈᾀ
ᾉᾁ
ᾊᾂ
ᾋᾃ
ᾌᾄ
ᾍᾅ
ᾎᾆ
ᾏᾇ
ᾼᾴ
ᾶ
ᾷ
ᾲ
ᾳ
Ὲὲ
Ἐἐ
Ἑἑ
Ἒἒ
Ἓἓ
Ἔἔ
Ἕἕ
Ὲ
Έ
ὲ
έ
Ἠἠ
Ὴὴ
Ἡἡ
Ἢἢ
Ἣἣ
Ἤἤ
Ἥἥ
Ἦἦ
Ἧἧ
ᾘᾐ
ᾙᾑ
ᾚᾒ
ᾛᾓ
ᾜᾔ
ᾝᾕ
ᾞᾖ
ᾟᾗ
Ὴ
Ή
ῌ
ῂ
ῃ
ῄ
ῆ
ῇ
ὴ
ή
Ἰἰ
Ἱἱ
Ἲἲ
Ἳἳ
Ἴἴ
Ἵἵ
Ἶἶ
Ἷἷ
Ὶὶ
Ῐῐ
ῒῗ
Ῑῑ
Ῐ
Ῑ
Ὶ
Ί
ῐ
ῑ
ῒ
ΐ
ῖ
ῗ
ὶ
ί
Ὸὸ
Ὀὀ
Ὁὁ
Ὂὂ
Ὃὃ
Ὄὄ
Ὅὅ
Ὸ
Ό
ὸ
ό
Ῥ
ῤ
ῥ
Ὺὺ
Ῠῠ
Ῡῡ
Ὑὑ
Ὓὓ
Ὕὕ
Ὗὗ
ϔ
ϓ
Ῠ
Ῡ
Ὺ
Ύ
ῢ
ῧ
ὐ
ῦ
ὒ
ὔ
ὖ
ὺ
ύ
ῠ
ῡ
ΰ
Ὼὼ
Ὠὠ
ᾨᾠ
ᾩᾡ
ᾪᾢ
ᾫᾣ
ᾬᾤ
ᾭᾥ
ᾮᾦ
ᾯᾧ
Ὡὡ
Ὢὢ
Ὣὣ
Ὤὤ
Ὥὥ
Ὦὦ
Ὧὧ
Ὼ
Ώ
ῼ
ῲ
ῳ
ῴ
ῶ
ῷ
ὼ
ώ
Cyrillic:
Ӑӑ
Ӓӓ
Ӷӷ
Ҕҕ
Ӗӗ
Ҽҽ
Ҿҿ
Ӛӛ
Ӝӝ
Ӂӂ
Ӟӟ
Ӣӣ
Ӥӥ
Ӣӣ
Ӧӧ
Ӫӫ
Ӱӱ
Ӯӯ
Ӳӳ
Ӵӵ
Ӹӹ
Ӭӭ
Ѷѷ
Relates to MC-154509, MC-153498, MC-150501, MC-156367, MC-156368
Comments

Please provide a resourcepack with example glyphs for these characters.
Which language (supported by Minecraft) uses these characters? If there's none, this is not a bug, but a feature request.

violine1101 The short answer is that there aren't any Minecraft languages that use these characters.
Thank you for your report!
However, this issue is Invalid.
You have posted a feature request or a suggestion. This site is for bug reports only.
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You seem to be operating from the assumption that Mojang is expected to support literally every character in Unicode for the Minecraft font. That's not true as best as I can tell, why would you ask them to waste their time doing that?
It would be better if you organized these letters based on the context/language within which they are used, so that the reasons for adding specific characters are more clear.