The core cast includes male protagonist Rintaro Okabe and female characters Kurisu Makise and Mayuri Shiina, with heterosexual romance routes driving emotional stakes in multiple endings. Ruka Urushibara appears as a boy who dresses femininely and becomes female in one timeline via D-Mail, serving as a time-travel plot device rather than identity exploration.

No character creation, pronoun selection, gender-agnostic dating, or developer statements on DEI, activism, or representation mandates exist in the 2009/2016 release. Searches confirm no consultancy involvement or narrative rewrites for social commentary. The Ruka element overlaps modern topics but functions as classic sci-fi trope without centrality to premise or themes.