Games like RWBY: Grimm Eclipse
Games like RWBY: Grimm Eclipse include Bayonetta, DmC: Devil May Cry, Stellar Blade™, ICEY, and NieR:Automata™. We matched them by the tags players give RWBY: Grimm Eclipse on Steam (Spectacle fighter, Hack and Slash, Beat 'em up, Female Protagonist, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

Bayonetta
Shared: Hack and Slash · Female Protagonist · Spectacle fighter

DmC: Devil May Cry
Shared: Hack and Slash · Spectacle fighter · Third Person

Stellar Blade™
Shared: Female Protagonist · Hack and Slash · Third Person

ICEY
Shared: Hack and Slash · Female Protagonist · Anime

NieR:Automata™
Shared: Hack and Slash · Spectacle fighter · Female Protagonist

LIZARDS MUST DIE
Shared: Spectacle fighter · Hack and Slash · Third Person

Devil May Cry 5
Shared: Hack and Slash · Spectacle fighter · Third Person

Soulstice
Shared: Spectacle fighter · Hack and Slash · Female Protagonist

Darksiders™
Shared: Hack and Slash · Third Person · Action

Internet Generation
Shared: Spectacle fighter · Hack and Slash · Beat 'em up

Mitsurugi Kamui Hikae
Shared: Hack and Slash · Female Protagonist · Cute

Dead as Disco
Shared: Spectacle fighter · Beat 'em up · Hack and Slash

Zenless Zone Zero
Shared: Hack and Slash · Cute · Anime

Blades of Time
Shared: Hack and Slash · Female Protagonist · Spectacle fighter

En Garde!
Shared: Spectacle fighter · Female Protagonist · Beat 'em up

Tomb Raider Game of the Year
Shared: Female Protagonist · Third Person · Action-Adventure

Darksiders III
Shared: Hack and Slash · Female Protagonist · Action-Adventure

MOTORSLICE
Shared: Female Protagonist · Action-Adventure · Hack and Slash

Granblue Fantasy: Relink
Shared: Hack and Slash · Anime · Third Person

Rise of the Tomb Raider™
Shared: Female Protagonist · Third Person · Action-Adventure

METAL GEAR RISING: REVENGEANCE
Shared: Hack and Slash · Spectacle fighter · Third Person

Hi-Fi RUSH
Shared: Hack and Slash · Action-Adventure · Spectacle fighter

One Piece Pirate Warriors 3
Shared: Hack and Slash · Beat 'em up · Anime

LOLLIPOP CHAINSAW RePOP
Shared: Hack and Slash · Female Protagonist · Third Person