I made this before I knew about fontzillion.

I will make a new zillion because of this corruption.

Error! is a unicode-like font that is derived from Catrinity by Alexander Lange and SuperPixel by @LuckyFontMaster (both LuckyFontMaster and Alexander Lange's account not found here)

THIS FONT SUPPORTS:

Basic Latin

Latin-1 Supplement

Latin Extended-A

Latin Extended-B

IPA Extensions

Spacing Modifier Glyphs

Combining Diacritics

Greek & Coptic

Cyrillic

Armenian

Hebrew

Arabic

Syriac/Syriac Extended

Thaana

Devenegari

Lao

Georgian

Khmer

Phonetic Extensions

Latin Extended Additional

General Punctuation (hence the 6 hyphens)

Currency Symbols

Dingbats

Arrows

Mathematical Operators

Miscallenous Symbols/Dingbats (hence the checkmark)

Braille

Latin Extended-C

Hiragana

Bopomofo

Hangul Jamo

CJK Characters

Lisu

Latin Extended-D

Latin Extended-E

Cyrillic Extended-C

Unifon

Solresol

Visible Speech

Klingon

Cursive (Hebrew)

Ligatures

Phoenician

Pau Cin Hau

Bhaiksuki Script

Lisu Supplement

Musical Symbols

Mayan Numerals

Counting Rod Numerals

Latin Extended-G

Kana Extended

Siyaq (HINDI)

Moon Symbols

Emoticons

Chess Pieces

Segment Numbers

Lawa

Shidinn

Old-Style Numbers

Music Symbols Extended-A

Icons

Logos

Nooalf

Extra Letters/Alternative Ligatures (hence the alt ligature of "ng")

Ancient Varient Letters (hence Visigothic script)

Very Obsolete Latin (Latin Extended-H)

Benjamin Franklin's Phonetic Alphabet + ligature ch (Latin Extended-I)

This is a font containing every Latin, Greek, and Cyrillic letter I could find. 

I did this font of my Windows laptop, so some letters may look similar to the default WIndows font.