Final Fantasy VII Remake "Hollow" as well as literally everything from Nier and Nier: Automata

Final Fantasy XI Chains of Promathia - Distant Worlds
Xanadu Next - White Lie in Black

From FFX i think Otherworld is another vocal track.

Great list. Very comprehensive. A few I can think of:
Klonoa 2 has a song in their fake language sung by him, Crash Nitro Kart's Japanese version has one in the title screen, Flower Sun and Rain has F.S.R.; No More Heroes 2, 3 and Travis Strikes Again have at least three each, TSA has the most of these.

Oh yeah, Bayonetta 3 just came out. It has at least two original vocal songs.

I'm pretty sure Re: Your Brains wasn't made for Left 4 Dead 2

"Ideal for Violence" from Yakuza Kiwami also has vocal bits in it

great list! I always love when games throw in original vocals. a few Im familiar with:

-Limbus Company is still releasing, but so far has "In Hell We Live, Lament", "Between Two Worlds", and "Pass On".
-Library of Ruina has "String Theocracy", "From a Place of Love", "And Then is Heard No More", "Iron Lotus", "Children of the City", "Gone Angels", and "Poems of a Machine". I probably missed a few even with all those
-Sayonara Wild Hearts has "Sayonara Wild Heart", "Begin Again", "Dead of Night", "Mine", "The World We Knew", "Inside", "Wild Hearts Never Die", and "A Place I Don't Know"
-Paradise Killer has "Paradise (Stay Forever)"
-Slime Rancher has "1,000 Light Years Away"
-I MAED A GAM3 W1TH Z0MB1ES 1NIT!!!!1 has the game's theme (and only song), generally referred to with the same name
-Cook, Serve, Delicious! 3!? has "It's Dangerous to Go Alone", "Apocalypse View", and a few written in pig-latin-spanish ("A La Idavay!", "Mufuchofo Gufustofo!", "Chakalaka")

If I'm not mistaken, the parts where they say "good eatin'" in the Golf theme in Pizza Tower were uniquely made for that song and could partially count also. Unless they're existing samples in which case, just ignore me.

Sludge Life has Bubble Up and Sludge Life
Sludge Life 2 has No Sequel, Git Dum, Sky Scrape, Eat The Rich, and Double Bubble

popslinger. i dont know which tracks beyond the one used in the trailer

also, industrial rage from wild woody is another track from that game with lyrics. there may be others that i dont remember but i know that one has some vocal parts

i'd also hesitate to include destati from kh - that opens an enormous avenue for songs with epic latin chanting and the like. if you're including that you'd probably want to include shit like "guardiano nel buio" too

I included Destati because it has an official lyrics sheet readily available. The main sources I use treat Guardando Nel Buio as an instrumental track

For Persona 3 FES Heartful Cry doesn't have any lyrics btw. (Also you don't have regular Persona 3 there either)
Also amazing job lots of effort put into this list and it's super impressive

Higurashi When They Cry Kai, Umineko When They Cry, Umineko When They Cry Chiru, Ciconia When They Cry, Hanachirasu, Fullmetal Daemon Muramasa and all Science Adventure Series have several original songs

Also, Yakuza 5 have one more original song called "Dream"

And the most recents Like a Dragon games's releases

@TheFred kinda irrelvent but I swear ever since I've started playing Higurashi it's everywhere, I can't escape

Oh and since I commented a irrelvent thing I'll make it up by saying:
FF7 Remake also has: Stamp (both in EN & JP), Scarlets theme, The Midgar Blues (JP & English), RUN RUN RUN (and maybe more I think but it's a big OST)
& Also Persona 3's Iwatodai Dorm only features stock lyrics, so I don't think it counts
Also Death Stranding has BB's Theme

@Ollchops The peak its inevitable, hope you like since its my favorite work (principally Higurashi Kai)

@TheFred I'm really enjoying, and as my first real VN experiance it's so good. It is indeed peak (And I'm only on like chapter 3)

Tatarigoshi its the first Kino arc, and its even better With Kai's Arc. Enjoy one of my favs generes/medias with THE goat!