Between the Good Guys, Bad Guys, and now the Grim Guys series, The Universe of Vuldranni is one of the most thoroughly flushed out I have seen in the litrpg space.

Complete LitRPGs:

• Threadbare series (including Small Medium and Dragon Hack) by Seiple (suggested order: trilogies TB1, SM, DH, TB2)

• Limitless Lands by Henegar

• Master Hunter K by From Hell

• World Tree Online by Hooper

• New Game Minus by Lin

• Light Online by Larcombe

• Eternal Online by Reynolds

• Retired S- Rank Adventurer by Wolfe & Falcon

• Life Reset by Kuznits

• Blessed Time and Viceroy's Pride by Plamann

• Towers of Heaven by Milan

• CivCEO by Karevik

• Forever Fantasy Online by Aaron and Bach

• This Trilogy is Broken (a.k.a. This Quest is Bullshit! from Royal Road) by Valentine (a.k.a. Nixia)

• War Aeternus by Dean

• PrimeVerse by Billiau

• Everybody Loves Large Chests by Iliev

• Somnia Online by Hanna

• The Dungeon Alaria by Kern

• Rise to Omniscience by Oster

• The Idle System by Pegaz

• Last Born of Ki'darth by McGowen

• Accidental Traveler (two complete trilogies) by Davis

• Savage Dominion by Chmilenko & Penman

• The Last Warrior of Unigaea and The Feedback Loop by Cooper

• Factory of the Gods (a.k.a. Keldora) by Raizman

• Nova Online by Knight

• Axe Druid by Johns

• Tower Climber and Arcane Kingdom Online by Tanner

• Emerilia by Chatfield

• Euphoria Online by Tucker

• Aether Gate Online by Hultberg

• Chronicles of Ethan (and standalone sequel Overpowered Howard) by Monk

• System Apocalypse™, Adventures on Brad, and Hidden Wishes by Wong

• Combat Codes by Darwin is great, but it's /r/ProgressionFantasy

• Death's Mantle by Cooper

• Space Seasons by Chapman

• Heroic Villain, and Bathrobe Knight by Dean

• Metagamer Chronicles by Hunter

• Fall of the Black Seraph by O'Kelley (a.k.a. The Genesis Game by Locke)

• Afterlife Online by Finn

• The Iron Teeth by Straughan

• Dungeons of Perdition by Basu

• Pangea Online by Rowland

• The Weaponized by Deckard

• Never Die Twice and Kairos by Durand (a.k.a. Void Herald on RR)

• Headshot Online by Siege

• Trinity of the Kairos by Sinclair

• Chronicles of Wycon by Moore

• Abduction Cycles by Cressman

• They Called Me MAD and The Houndsman by Pal

• The Bright Lord by Knowles

• Nora Hazard by Corvin

• Beast Realms by Jones

• Arena Manager by Opo

• Frostworld by Peel

• Magnus by Prime

• Metamorphosis Online by Grey

• Alterlife by Moss

• Underverse by Cajiao

• The Orzare Chronicles by O Toole

• Alpha Physics by Kozlowski

• Legends of Ascension by Hultberg

• Badges of Dorkdom by Hodges

• Star Divers by Landry

• Legendary Farmer by Elizabeth Oswald

• Class Shift by Sean Oswald

• Ten Realms by Chatfield

• The Weight of it All by Thorn

• Phase Shift by Johnson

• Voidbringer Campaign by Hall

• Sky Realms by Osgood

• Cultivator vs. System by Valerios

• Uniworld Online and Glendara Awakens by Brooks

• Freedom Online by Lingard

• Enora Online by Adams

• Harbinger by Keene

• Bad Luck Charlie (a.k.a. Dragon Mage) by Baron

• Apocosmos by Gkirgkiris

• Real- Time Starcommander by Gregory

• Dungeon Realms by Yang

• Death's Favorite Warlock by Dean

• The Game of Gods by Kern

• Tower Apocalypse by Cassius & Tang

• Real- Time Starcommander by Gregory

• Hack, Slash & Burn by Herzman

• Cowboy Necromancer (some novellas to follow) & Tokens & Towers by Cooper

• Apocalypse Gates (and I think other series) by Schinhofen