Games like Costume Quest 2
Games like Costume Quest 2 include South Park™: The Stick of Truth™, Costume Quest, Yakuza: Like a Dragon, Slime Rancher, and West of Loathing. We matched them by the tags players give Costume Quest 2 on Steam (RPG, Adventure, Casual, Comedy, and Turn-Based Combat): closest matches first, and among equally close ones the better-known games.

South Park™: The Stick of Truth™
Shared: RPG · Adventure · Comedy

Costume Quest
Shared: RPG · Adventure · Casual

Yakuza: Like a Dragon
Shared: RPG · Adventure · Turn-Based Combat

Slime Rancher
Shared: Adventure · Cute · Singleplayer

West of Loathing
Shared: RPG · Comedy · Adventure

Ruined King: A League of Legends Story™
Shared: RPG · Adventure · Turn-Based Combat

Epic Battle Fantasy 4
Shared: Adventure · RPG · Funny

Nexomon: Extinction
Shared: RPG · Casual · Turn-Based Combat

Epic Battle Fantasy 5
Shared: Adventure · Funny · RPG

South Park™: The Fractured But Whole™
Shared: RPG · Comedy · Funny

Cat Quest
Shared: RPG · Adventure · Cute

Like a Dragon: Infinite Wealth
Shared: Adventure · Turn-Based Combat · Comedy

Swords and Souls: Neverseen
Shared: RPG · Turn-Based Combat · Singleplayer

Baldur's Gate 3
Shared: RPG · Turn-Based Combat · Adventure

Donut County
Shared: Casual · Funny · Adventure

Pikuniku
Shared: Adventure · Casual · Funny

Clair Obscur: Expedition 33
Shared: RPG · Turn-Based Combat · Singleplayer

Scribblenauts Unlimited
Shared: Adventure · Casual · Singleplayer

Knights of Pen and Paper 2
Shared: RPG · Adventure · Turn-Based

Magicka
Shared: Comedy · RPG · Adventure

Gang Beasts
Shared: Funny · Casual · Singleplayer

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Adventure · Singleplayer

Hyperdimension Neptunia Re;Birth1
Shared: RPG · Comedy · Singleplayer

Swords and Sandals Classic Collection
Shared: RPG · Turn-Based Combat · Casual