Games like Necro Story
Games like Necro Story include Undertale, DELTARUNE, OMORI, Epic Battle Fantasy 5, and Cassette Beasts. We matched them by the tags players give Necro Story on Steam (RPG, Comedy, Creature Collector, Funny, and Party-Based RPG): closest matches first, and among equally close ones the better-known games.

Undertale
Shared: Story Rich · RPG · Great Soundtrack

DELTARUNE
Shared: RPG · Story Rich · Funny

OMORI
Shared: RPG · Story Rich · Great Soundtrack

Epic Battle Fantasy 5
Shared: Funny · Creature Collector · Comedy

Cassette Beasts
Shared: Creature Collector · Party-Based RPG · RPG

Persona 4 Golden
Shared: RPG · Story Rich · Great Soundtrack

West of Loathing
Shared: RPG · Comedy · Funny

Persona 3 Reload
Shared: RPG · Party-Based RPG · Story Rich

Persona 5 Royal
Shared: RPG · Story Rich · Party-Based RPG

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

Bug Fables: The Everlasting Sapling
Shared: RPG · Party-Based RPG · Funny

Clair Obscur: Expedition 33
Shared: RPG · Story Rich · Great Soundtrack

South Park™: The Fractured But Whole™
Shared: RPG · Comedy · Funny

Hyperdimension Neptunia Re;Birth1
Shared: RPG · Comedy · Funny

OCTOPATH TRAVELER II
Shared: RPG · Party-Based RPG · Story Rich

Yakuza: Like a Dragon
Shared: RPG · Story Rich · Funny

To the Moon
Shared: Story Rich · Great Soundtrack · RPG

Chicory: A Colorful Tale
Shared: RPG · Great Soundtrack · Indie

Donut County
Shared: Funny · Indie · Casual

Digimon Story Time Stranger
Shared: RPG · Creature Collector · Party-Based RPG

Kabuto Park
Shared: Creature Collector · RPG · Colorful

WitchSpring R
Shared: RPG · Funny · Story Rich

Nexomon: Extinction
Shared: RPG · Creature Collector · Funny

Untitled Goose Game
Shared: Funny · Comedy · Villain Protagonist