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Drawing on an assessment of the platform\u2019s design, and the first civil lawsuit brought against Character.ai in the USA in 2024 following the suicide of a teenage user, this paper identifies unresolved ethical issues in companion-based AI technologies. These include risks from difficulty in separating AI-based roleplay from real life, unconstrained AI models performing edgy characters, reality detachment, and confusion by dishonest anthropomorphism and emulated empathy. All have implications for safety measures for vulnerable users. While acknowledging the potential benefits of AI companions, this paper argues for the urgent need for ethical frameworks that balance innovation with user safety. By proposing actionable recommendations for design and governance, the paper aims to guide industry, policymakers, and scholars in fostering safer and more responsible AI companion platforms.\n                  <\/jats:p>","DOI":"10.1007\/s00146-025-02408-5","type":"journal-article","created":{"date-parts":[[2025,6,10]],"date-time":"2025-06-10T00:41:33Z","timestamp":1749516093000},"page":"6365-6377","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Move fast and break people? Ethics, companion apps, and the case of Character.ai"],"prefix":"10.1007","volume":"40","author":[{"given":"Vian","family":"Bakir","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew","family":"McStay","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,6,10]]},"reference":[{"key":"2408_CR1","doi-asserted-by":"crossref","unstructured":"Bakir V, McStay A (2024) IEEE P7014.1: Is deception in emulated empathy innately bad? IEEE Standards Association white paper. https:\/\/standards.ieee.org\/ieee\/White_Paper\/11856\/ Accessed 21 Feb 2025","DOI":"10.1109\/ISTAS61960.2024.10732349"},{"key":"2408_CR2","doi-asserted-by":"publisher","unstructured":"Bakir V, Bennet K, Bland B, Laffer A, Li P, McStay A (2024) When is deception OK? 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