Here’s a bunch of suggestions:

The Kid:

Plants vs Zombies
Subway Surfers
Slender: The Eight Pages
Friday Night Funkin
Poppy Playtime
Skylanders: Spyro’s Adventure
Bloons TD 6
Hello Neighbor
Cut the Rope
Spore

The Gamer:

Castlevania
Castlevania: Symphony of the Night
Super Metroid
Metroid Prime
Don’t Starve Together
Resident Evil 4 (OG)
Slay the Spire
Enter the Gungeon
Diablo 2
Deathloop
A Short Hike
Max Payne
Max Payne 3
Fez
Hyper Light Drifter
Journey
Contra (1988)
Alan Wake 2
Baldur’s Gate 3
Street Fighter 2: The World Warrior
Devil May Cry 5
Braid
Batman: Arkham Asylum
Dead Cells
Elden Ring
Into the Breach
The Legend of Zelda: Ocarina of Time
Journey
Soma
Super Meat Boy
Need for Speed: Underground 2
Need for Speed: Most Wanted (2005)
SuperHot
Gris
Marvel’s Spider-Man

The Weird Guy:

Prey (2017)
Star Wars: Jedi Knight 2 - Jedi Outcast
Star Wars: Jedi Knight - Jedi Academy
Devil May Cry 3: Dante’s Awakening
Shin Megami Tensei: Nocturne
Grim Fandango
Ultima Online
Star Wars: Battlefront 2 (2005)
Full Throttle
Paper Mario: The Thousand Year Door
Dark Messiah: Of Might and Magic
Beyond Good & Evil
Kingdom Rush
Guacamelee!
Shantae and the Pirate’s Curse
Legacy of Kain: Soul Reaver
Iron Lung
Hypnospace Outlaws
Condemned: Criminal Origins
Machinarium
Gunstar Heroes
CrossCode
Library of Ruina
Splinter Cell: Chaos Theory
Inscryption
PaRappa The Rapper
Epic Battle Fantasy 5
God Hand
Touhou 6: The Embodiment of Scarlet Devil
Quake 3 Arena
Mario & Luigi: Bowser’s Inside Story
Environmental Station Alpha
Touhou Luna Nights
Creaks
Pizza Tower
Psychonauts
Wario Land 4
Ratchet & Clank (2002)
Jak and Daxter: The Precursor Legacy
Gitaroo Man!
Rez
Kane & Lynch 2: Dog Days
Street Fighter III: 3rd Strike
Lost in Vivo
Okami
The Longest Journey
Hitman: Blood Money
Hotel Dusk: Room 215
Chibi-Robo!
Ridge Racer Type 4
Alan Wake
The Henry Stickmin Collection (stand-in for the entire franchise)
Mark of the Ninja

The Outcast:

Prey (2006)
Blade Runner (1997)
Call of Cthulhu: Dark Corners of the Earth
Call of Cthulhu: Shadow of the Comet
Clive Barker’s Undying
Ultima IV: Quest of the Avatar
The Last Express
Gothic
Ultima Underworld: The Stygian Abyss
Nosferatu: Wrath of Malachi
Hexen: Beyond Heretic
Hexen 2
Arx Fatalis
Redneck Rampage
Kingpin: Life of Crime
The Dream Machine
Chasm: The Rift
Cryostasis
Gabriel Knight: Sins of the Father
Blood Omen: Legacy of Kain
Breath of Fire: Dragon Quarter
deSpiria
Toonstruck
Alien Soldier
Shadow Tower
Shadow Tower: Abyss
Echo Night
Kuon
Anachronox
The Operative: No One Lives Forever
Baldur’s Gate 2
Primordia
Beneath a Steel Sky
Enemy Zero
The 7th Guest
Prisoner of Ice
Haunting Ground
Claw
Fear & Hunger
The Elder Scrolls 2: Daggerfall
Icewind Dale 2
Darklands
D2
Panzer Dragoon Saga
Little Samson
Sin & Punishment
Star Wars: Dark Forces
Nightlong: Union City Conspiracy
Ripper
Tex Murphy: Under a Killing Moon
La-Mulana
Outcast (lol)
Advent Rising
Twisted Metal: Black
Wonder Project J2
Spy Fiction
The 7th Guest
Koudelka
SiN
Pulseman
Nightmare Creatures
Nocturne
Gex: Enter the Gecko
Michigan: Report from Hell
Dungeon Siege
Darkwatch
Sentinel Returns
Wurroom
Strife: Quest for the Sigil
Powerslave
Shadow Man
The Dark Mod
Vagrant Story
Deadly Premonition
Dujanah
Zork Nemesis: The Forbidden Lands
Shivers
Shivers II: Harvest of Souls
Moonlight Syndrome
Clock Tower
UnReal World
Cultist Simulator
Armored Core: For Answer
Tenchu: Stealth Assassins

The Hardcore:

The Dark Eye
Ultima: The First Age of Darkness
Akalabeth: World of Doom (1979)
Iron Angel of the Apocalypse
Vivisector
Wasteland
Tales of the Unknown: Volume I - The Bard's Tale
Amber: Journeys Beyond
3D Monster Maze
BloodNet
Kileak: The DNA Imperative
Epidemic
Abuse
Alice: An Interactive Museum
The Elder Scrolls: Arena
The Terminator: Skynet
Martian Gothic: Unification
Shy Dwarf
Realms of the Haunting
Silent Hill: Play Novel
L-Zone
John Saul’s Blackstone Chronicles
Dead of the Brain
Ring: The Legend of the Nibelungen
Witchaven
Cybermage: Darklight Awakening
Four-Sight
Amerzone
Mode
Gothos
Roommania #203
Ken’s Labyrinth

The Alien:

Demonophobia
Surrealidade: Expressões do Inconsciente
Taboo: The Sixth Sense
The Space Bar

The Pioneer:

Ugetsu Kitan
Mr Mix
Ayumi: Enhanced Edition
Kang-Fu

You may change the placement for some of these games as you wish (and I may have put a game that was already on the list).

@Rogueliker Thanks so much for the suggestions! I'll definitely be adding these to the list soon, as they would be great additions.