Games like Fastest Fantasy Life Simulator
Games like Fastest Fantasy Life Simulator include The Henry Stickmin Collection, Undertale, Reigns, Magicka, and Volcano Princess. We matched them by the tags players give Fastest Fantasy Life Simulator on Steam (Choose Your Own Adventure, Local Co-Op, Multiple Endings, Choices Matter, and Comedy): closest matches first, and among equally close ones the better-known games.

The Henry Stickmin Collection
Shared: Choose Your Own Adventure · Multiple Endings · Funny

Undertale
Shared: Multiple Endings · Choices Matter · RPG

Reigns
Shared: Choices Matter · Choose Your Own Adventure · RPG

Magicka
Shared: Comedy · RPG · Local Co-Op

Volcano Princess
Shared: Multiple Endings · Choices Matter · RPG

Legend of Mortal
Shared: Multiple Endings · Choices Matter · RPG

Yes, Your Grace
Shared: Choices Matter · RPG · Multiple Endings

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Choices Matter · Multiple Endings

Dispatch
Shared: Choices Matter · Choose Your Own Adventure · Comedy

Growing Up
Shared: Choices Matter · Life Sim · Multiple Endings

Pummel Party
Shared: Funny · 4 Player Local · Local Co-Op

Magical Princess
Shared: Multiple Endings · Choices Matter · RPG

Tales from the Borderlands
Shared: Comedy · Choices Matter · Choose Your Own Adventure

Suzerain
Shared: Choose Your Own Adventure · Choices Matter · Multiple Endings

The Stanley Parable
Shared: Comedy · Funny · Multiple Endings

Roadwarden
Shared: RPG · Choose Your Own Adventure · Choices Matter

The Yawhg
Shared: Choose Your Own Adventure · Local Co-Op · RPG

Overcooked! 2
Shared: Local Co-Op · Funny · Local Multiplayer

The Life and Suffering of Sir Brante
Shared: Choices Matter · Choose Your Own Adventure · RPG

Baldur's Gate 3
Shared: Choices Matter · RPG · Adventure

Choice of Life: Middle Ages
Shared: Choices Matter · Choose Your Own Adventure · RPG

West of Loathing
Shared: Comedy · RPG · Funny

CHANGE: A Homeless Survival Experience
Shared: Choose Your Own Adventure · RPG · Life Sim

South Park™: The Stick of Truth™
Shared: Comedy · RPG · Funny