Games like Mortal Vessel
Games like Mortal Vessel include Stoneshard, Darkest Dungeon®, Elin, Clair Obscur: Expedition 33, and Coromon. We matched them by the tags players give Mortal Vessel on Steam (Turn-Based Combat, Character Customization, Procedural Generation, JRPG, and Turn-Based): closest matches first, and among equally close ones the better-known games.

Stoneshard
Shared: Roguelike · Turn-Based · Procedural Generation

Darkest Dungeon®
Shared: Turn-Based Combat · Dungeon Crawler · Roguelike

Elin
Shared: Character Customization · JRPG · Roguelike

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

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

Caves of Qud
Shared: Turn-Based Combat · Procedural Generation · Turn-Based

Path of Achra
Shared: Character Customization · Turn-Based Combat · Roguelike

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

Swords and Souls: Neverseen
Shared: Turn-Based Combat · Character Customization · Turn-Based

Crown Trick
Shared: Turn-Based Combat · Roguelike · Dungeon Crawler

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

Battle Chasers: Nightwar
Shared: Turn-Based Combat · JRPG · Turn-Based

Tales of Maj'Eyal
Shared: Turn-Based · Roguelike · Procedural Generation

Rift Wizard
Shared: Character Customization · Turn-Based Combat · Roguelike

XCOM 2
Shared: Turn-Based Combat · Character Customization · Strategy

Darkest Dungeon® II
Shared: Dungeon Crawler · Turn-Based Combat · Roguelike

Slay the Spire
Shared: Turn-Based · Roguelike · Singleplayer

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

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

Aethermancer
Shared: Turn-Based · Roguelike · JRPG

OCTOPATH TRAVELER™
Shared: JRPG · Turn-Based Combat · Turn-Based

Bug Fables: The Everlasting Sapling
Shared: Turn-Based · JRPG · Exploration

Megaloot
Shared: Character Customization · Dungeon Crawler · Turn-Based Combat

Quasimorph
Shared: Turn-Based Combat · Roguelike · Turn-Based