Games like RPG MO
Games like RPG MO include Trove, Albion Online, Neverwinter, Terraria, and The Elder Scrolls Online - Standard Edition. We matched them by the tags players give RPG MO on Steam (Free to Play, RPG, MMORPG, Massively Multiplayer, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Trove
Shared: Free to Play · MMORPG · Pixel Graphics

Albion Online
Shared: Free to Play · MMORPG · Massively Multiplayer

Neverwinter
Shared: Free to Play · RPG · MMORPG

Terraria
Shared: Multiplayer · Pixel Graphics · Adventure

The Elder Scrolls Online - Standard Edition
Shared: RPG · MMORPG · Open World

Where Winds Meet
Shared: Free to Play · Multiplayer · Open World

Destiny 2
Shared: Free to Play · MMORPG · Multiplayer

Guild Wars 2®
Shared: Free to Play · MMORPG · RPG

Once Human
Shared: Free to Play · Multiplayer · Open World

Stardew Valley
Shared: RPG · Pixel Graphics · Multiplayer

FINAL FANTASY XIV Online
Shared: RPG · MMORPG · Massively Multiplayer

Star Trek Online
Shared: Free to Play · Massively Multiplayer · MMORPG

Dark and Light
Shared: RPG · Massively Multiplayer · Open World

Last Oasis
Shared: Massively Multiplayer · RPG · Open World

Path of Exile
Shared: Free to Play · MMORPG · Multiplayer

Project: Gorgon
Shared: RPG · Massively Multiplayer · MMORPG

Blue Protocol: Star Resonance
Shared: MMORPG · Free to Play · RPG

Necesse
Shared: Pixel Graphics · Multiplayer · Open World

Mortal Online
Shared: Free to Play · Massively Multiplayer · RPG

ATLAS
Shared: Massively Multiplayer · Open World · Adventure

Enshrouded
Shared: RPG · Open World · Multiplayer

The Quinfall
Shared: Massively Multiplayer · MMORPG · RPG

PixARK
Shared: Massively Multiplayer · Multiplayer · Adventure

Pantheon: Rise of the Fallen
Shared: RPG · MMORPG · Adventure