TheirSide

TheirSide is an AI character chat site with a library of written personas, story-driven scenes, and group chats that allow up to four AI characters in one conversation. Custom characters can be created, and the site says starting is free.

TheirSide is an AI character chat platform built around two ideas that most companion apps keep separate: one-on-one conversations with written personas, and group chats where several AI characters share the same room. The character library is the front door. Each profile pairs a portrait with a short personality sketch and an opening line, so a visitor can judge the tone of a character before typing anything. The roster leans toward relationship-driven archetypes: the reserved companion who warms slowly, the sharp woman who calls out self-deception, the neighbor figure who sees through bravado, the hotel night manager who reads a room. There is a comparable set of male characters with their own temperaments, from the steady listener to the quick-witted one who turns serious when it matters. In practice, chatting starts from a character card. The opening line sets the scene, and the exchange continues as an open-ended conversation rather than a fixed script. The homepage also references story-driven scenes, which suggests structured premises layered on top of the character premise. The distinct feature is the group chat: up to four AI characters can be brought into one conversation, which changes the dynamic from a private exchange into something closer to an ensemble scene, with characters reacting to each other and not only to the user. Custom character creation is available as well, aimed at people who want a persona that is not in the public library. That puts TheirSide in the same territory as character hubs and roleplay apps, but its emphasis on multi-character scenes is the differentiator. The site states that starting is free, which lowers the barrier for testing whether the group format holds up over a long conversation. Who it suits: readers and roleplay hobbyists who want ensemble interaction rather than a single companion, and writers who want to watch several personalities negotiate a scene. The homepage does not publish model details, memory limits, or content boundaries beyond what the character descriptions imply.