Character creation provides Inkling and Octoling options with two body-type styles per species that influence voice lines and localized pronouns in non-English versions, framed simply as choices about appearance and sound. This mechanic directly extends the flexible, non-binary-labeled system from Splatoon 3 without introducing dedicated gender or pronoun selection screens, keeping the focus on stylistic variety rather than ideological framing. The single-player action-RPG premise stays rooted in exploration, combat builds, and salvage objectives, with no romance systems, identity-focused story arcs, or social commentary layered into the narrative.

The prominent role of the pre-existing Deep Cut companions reinforces continuity with prior entries instead of serving as a vehicle for new messaging. No creator statements address DEI initiatives, activist consultations, narrative rewrites, or identity-politics themes in marketing or plot, confirming the low level of progressive content.