Games like Guile & Glory: Firstborn
Games like Guile & Glory: Firstborn include The Last Spell, Fell Seal: Arbiter's Mark, Jagged Alliance 3, The Banner Saga, and Symphony of War: The Nephilim Saga. We matched them by the tags players give Guile & Glory: Firstborn on Steam (Tactical RPG, Strategy RPG, Turn-Based Strategy, RPG, and Strategy): closest matches first, and among equally close ones the better-known games.

The Last Spell
Shared: Turn-Based Strategy · RPG · Strategy

Fell Seal: Arbiter's Mark
Shared: RPG · Strategy · Tactical RPG

Jagged Alliance 3
Shared: Strategy · Turn-Based Strategy · Tactical RPG

The Banner Saga
Shared: Tactical RPG · Strategy RPG · Turn-Based Strategy

Symphony of War: The Nephilim Saga
Shared: Tactical RPG · RPG · Turn-Based Strategy

Songs of Conquest
Shared: Turn-Based Strategy · Strategy RPG · Turn-Based Tactics

Marvels Midnight Suns Digital Edition
Shared: Tactical RPG · Turn-Based Strategy · Turn-Based Tactics

Battle Brothers
Shared: Turn-Based Strategy · RPG · Strategy

FINAL FANTASY TACTICS - The Ivalice Chronicles
Shared: Tactical RPG · Turn-Based Strategy · Strategy RPG

Banner of the Maid
Shared: Turn-Based Strategy · Strategy · RPG

Into the Breach
Shared: Turn-Based Strategy · Strategy · Turn-Based Tactics

Age of Wonders 4
Shared: Turn-Based Strategy · Strategy · RPG

Tactical Breach Wizards
Shared: Turn-Based Strategy · Turn-Based Tactics · Strategy RPG

Wargroove
Shared: Tactical RPG · Strategy · Turn-Based Strategy

Legends of Kingdom Rush
Shared: Tactical RPG · Turn-Based Strategy · Strategy RPG

Tinyfolks
Shared: Tactical RPG · RPG · Turn-Based Strategy

MENACE
Shared: Turn-Based Strategy · RPG · Strategy

XCOM 2
Shared: Strategy · RPG · Turn-Based Combat

Disgaea 5 Complete
Shared: RPG · Strategy · Tactical RPG

TROUBLESHOOTER: Abandoned Children
Shared: Tactical RPG · Strategy RPG · Turn-Based Strategy

Super Robot Wars 30
Shared: RPG · Strategy · Turn-Based Strategy

Warhammer 40,000: Chaos Gate - Daemonhunters
Shared: Turn-Based Strategy · Strategy RPG · Strategy

Dark Deity
Shared: Strategy RPG · Turn-Based Strategy · RPG

XCOM®: Chimera Squad
Shared: Turn-Based Strategy · Strategy · Turn-Based Tactics