Games like Astra Bestiary
Games like Astra Bestiary include Coromon, Monster Sanctuary, Temtem, Cassette Beasts, and Clair Obscur: Expedition 33. We matched them by the tags players give Astra Bestiary on Steam (Creature Collector, JRPG, 2D, Character Customization, and Turn-Based Combat): closest matches first, and among equally close ones the better-known games.

Coromon
Shared: Creature Collector · JRPG · Turn-Based Combat

Monster Sanctuary
Shared: Creature Collector · Turn-Based Combat · Singleplayer

Temtem
Shared: Creature Collector · Turn-Based Combat · Adventure

Cassette Beasts
Shared: Creature Collector · JRPG · Turn-Based Combat

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

Monster Hunter Stories 3: Twisted Reflection
Shared: Creature Collector · JRPG · Turn-Based Combat

Elin
Shared: Character Customization · JRPG · Open World

FINAL FANTASY
Shared: JRPG · Turn-Based Combat · 2D

Aniimo
Shared: Creature Collector · Open World · Exploration

Hogwarts Legacy
Shared: Character Customization · Singleplayer · Open World

Digimon Story Time Stranger
Shared: JRPG · Creature Collector · Collectathon

FINAL FANTASY VI
Shared: JRPG · 2D · Singleplayer

Monster Crown
Shared: JRPG · Creature Collector · Turn-Based Combat

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

Chained Echoes
Shared: JRPG · 2D · Turn-Based Combat

The Elder Scrolls Online - Standard Edition
Shared: Singleplayer · Open World · Adventure

Persona 5 Royal
Shared: JRPG · Turn-Based Combat · Singleplayer

The Elder Scrolls IV: Oblivion Remastered
Shared: Character Customization · Singleplayer · Open World

Ni no Kuni Wrath of the White Witch™ Remastered
Shared: JRPG · Creature Collector · Adventure

Epic Battle Fantasy 5
Shared: JRPG · Creature Collector · Turn-Based Combat

Starfield
Shared: Singleplayer · Character Customization · Open World

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

Nexomon
Shared: Creature Collector · Turn-Based Combat · Adventure

FINAL FANTASY V
Shared: JRPG · 2D · Singleplayer