Games like I, the Forgotten One
Games like I, the Forgotten One include The Life and Suffering of Sir Brante, Mount & Blade II: Bannerlord, To the Moon, Kingdom Come: Deliverance, and Middle-earth: Shadow of War. We matched them by the tags players give I, the Forgotten One on Steam (Adventure, Psychological, War, Casual, and Medieval): closest matches first, and among equally close ones the better-known games.

The Life and Suffering of Sir Brante
Shared: RPG · Interactive Fiction · Medieval

Mount & Blade II: Bannerlord
Shared: Medieval · War · RPG

To the Moon
Shared: Adventure · Story Rich · Interactive Fiction

Kingdom Come: Deliverance
Shared: Medieval · RPG · Adventure

Middle-earth: Shadow of War
Shared: Adventure · RPG · War

Kingdom Come: Deliverance II
Shared: Medieval · RPG · Adventure

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

Roadwarden
Shared: Adventure · RPG · Text-Based

Crimson Desert Enhanced
Shared: Adventure · Medieval · RPG

Finding Paradise
Shared: Adventure · RPG · Psychological

Florence
Shared: Adventure · Casual · Indie

Yes, Your Grace
Shared: Medieval · RPG · Casual

Mount & Blade: Warband
Shared: Medieval · RPG · Adventure

Reigns
Shared: Medieval · Adventure · RPG

Sands of Salzaar
Shared: War · Adventure · RPG

God of War
Shared: Adventure · RPG · Story Rich

DAVE THE DIVER
Shared: Adventure · Casual · RPG

Hellblade: Senua's Sacrifice
Shared: Psychological · Adventure · Story Rich

Suzerain
Shared: Choose Your Own Adventure · Interactive Fiction · Text-Based

The Test
Shared: Psychological · Choose Your Own Adventure · Story Rich

Melvor Idle
Shared: Casual · Adventure · RPG

Plebby Quest: The Crusades
Shared: Casual · Adventure · RPG

Impostor Factory
Shared: Adventure · RPG · Story Rich

There Is No Game: Wrong Dimension
Shared: Adventure · Casual · Indie