Games like Ragnarok Online 2
Games like Ragnarok Online 2 include Neverwinter, Blue Protocol: Star Resonance, The Elder Scrolls Online - Standard Edition, Albion Online, and FINAL FANTASY XIV Online. We matched them by the tags players give Ragnarok Online 2 on Steam (Free to Play, RPG, MMORPG, Massively Multiplayer, and Anime): closest matches first, and among equally close ones the better-known games.

Neverwinter
Shared: Free to Play · RPG · MMORPG

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

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

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

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

Destiny 2
Shared: Free to Play · MMORPG · Multiplayer

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

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

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

Trove
Shared: Free to Play · MMORPG · RPG

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

Wuthering Waves
Shared: Free to Play · Anime · RPG

Phantasy Star Online 2 New Genesis
Shared: Free to Play · MMORPG · Massively Multiplayer

SMITE®
Shared: Free to Play · Multiplayer · MMORPG

DRAGON BALL Z: KAKAROT
Shared: RPG · Anime · Action

SWORD ART ONLINE Alicization Lycoris
Shared: RPG · Anime · MMORPG

FINAL FANTASY XV WINDOWS EDITION
Shared: RPG · JRPG · Open World

DRAGON BALL XENOVERSE 2
Shared: Anime · Multiplayer · Massively Multiplayer

Monster Hunter: World
Shared: RPG · Multiplayer · Open World

Marvel Rivals
Shared: Free to Play · Multiplayer · RPG

Karos
Shared: Free to Play · RPG · MMORPG

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

Sword Art Online: Fatal Bullet
Shared: RPG · Anime · Multiplayer

Honkai Impact 3rd
Shared: Free to Play · RPG · Anime