These games, zines, and other materials are about plurality, have plural characters, or have plural themes. What do I mean by plurality? This definition is an excerpt from "A list of some alterhuman identities and groups," an article that I helped co-author:
"Plurality (or multiplicity) is an umbrella term for all experiences and identities in which more than one entity, consciousness, or pseudo-consciousness exists within one physical body, for systems who are or can be diagnosed with dissociative identity disorder (DID), formerly called multiple personality disorder (MPD), as well as systems who do not meet those diagnostic criteria. Plurality and multiplicity as terms have always been inclusive of systems regardless of their origin or diagnoses. Some plural systems have members who aren’t human or who are fictional characters or species. Multiplicity can be an interchangeable synonym for plurality, or multiplicity can mean a form of plurality in which more than one person, self, or identity is within a single body."
Some other people have made collections of plural content on itch.io.
On my profile, you can also find a collection I made for fictives, one for nonhumans, and more things that plurals and other alterhumans might tend to like.
WARNING: There is a lot of adult content and troubling subject matter in this collection, so please use caution as you explore it. I haven't played/read all of these yet, so I haven't been able to label most of them with content warnings.
Unrated. Photosensitivity warning: glitches, flashes of light and color. Interactive poems.
Rated R, 18+ (rating and content warnings vary by each piece in this pack). This contains all of LB Lee's creations, some of which are also sold separately, some which aren't, and some of which are only available in this pack and nowhere else. If it's in your budget so you'd rather get 'em all than pick and choose, then I highly recommend this pack.
Rated R, 18+ (specific content warnings are given at the beginning of each chapter). A memoir introducing LB Lee, a plural system who made many of the materials in this collection, for which this book provides important context.
Rated R, 18+. Experiences and advice about sex *within* plural systems: dysphoria, safer sex, and more. Important to know, recommended.
Rated PG. Three ghost stories about plurality.
Rated PG. Description of a personal experience of one system member losing the ability to talk, and very useful advice about how to deal with it! Recommended reading.
Rated R, 18+. A zine about being a protector alter.
Rated PG-13 (or higher?). A series of zines of carefully-cited research about an important aspect of plural community history.
Rated PG. LB's comic book diary about attending the wedding of some plural friends. Sweet and thoughtful reflections on plural experiences of love and gender.
Rated G. A platform game that some players have pointed out seems to have plural themes. Plural Stories review.
Rated PG-13 (psychological horror, non-graphic violence, blood, and mentions of bullying). A puzzle game about a shut-in tween who finds herself in an imaginary world.
Rated G. A photo-illustrated memoir comic about how a certain board game from 1993 has gameplay features similar to the authors' plural system. Plural Stories review.
Rated G; photosensitivity warning for rapidly shaking text. A short Twine poem about a system discovering that they're plural.
Rated R, 18+ (sexual trauma, body dysmorphia, nudity, mild flickering). An illustrated zine. Plural Stories review.
Rated R, 18+ (sex and violence in nature). A short story inspired by the authors' experiences of being therian, trans, and plural. Plural Stories review.
Rated PG (swear words; specific content warnings at the beginning of each chapter). A short Twine game about discovering that you're a plural system. Plural Stories review.
Rated G. A short Twine game showing a pleasant slice-of-life for a plural system. Plural Stories review.
Rated G. A tool for more elaborate pronoun support for Twitch users, intentionally inclusive of plural systems.
Rated NC-17, 18+ (it's porn; specific content warnings are on the game page). In this Twine game, a member of a plural system explores BDSM.
Unrated. In development. A short atmospheric walking sim on a starship, with light puzzle elements, rooted in plurality.