The emergence of virtual companions is transforming the evolution of intelligent systems that effortlessly cater to the unique requirements of users. These advanced systems not only take into account the user present capabilities, preferences, and needs but also possess the capability to adapt dynamically to changes in the environment, as well as fluctuations in the users emotional state or behavior. A virtual companion is an intelligent software or application that offers support, assistance, and companionship across various aspects of users lives. Various enabling technologies are involved in building virtual companion, among these, Augmented Reality (AR), and Virtual Reality (VR) are emerging as transformative tools. While their potential for use in virtual companions or digital assistants is promising, their applications in these domains remain relatively unexplored. To address this gap, a systematic review was conducted to investigate the applications of VR, AR, and MR immersive technologies in the development of virtual companions. A comprehensive search across PubMed, Scopus, and Google Scholar yielded 28 relevant articles out of a pool of 644. The review revealed that immersive technologies, particularly VR and AR, play a significant role in creating digital assistants, offering a wide range of applications that brings various facilities in the individuals life in areas such as addressing social isolation, enhancing cognitive abilities and dementia care, facilitating education, and more. Additionally, AR and MR hold potential for enhancing Quality of life (QoL) within the context of virtual companion technology. The findings of this review provide a valuable foundation for further research in this evolving field.

翻译：虚拟伴侣的出现正在改变智能系统的发展，使其能够轻松满足用户的独特需求。这些先进系统不仅考虑了用户当前的能力、偏好和需求，还具备动态适应环境变化以及用户情绪状态或行为波动的能力。虚拟伴侣是一种智能软件或应用程序，在用户生活的各个方面提供支持、帮助和陪伴。构建虚拟伴侣涉及多种使能技术，其中增强现实（AR）和虚拟现实（VR）正逐渐成为变革性工具。尽管它们在虚拟伴侣或数字助理中的应用前景广阔，但这些领域的应用仍相对未被充分探索。为弥补这一空白，本研究采用系统性综述方法，探究VR、AR及混合现实（MR）等沉浸式技术在虚拟伴侣开发中的应用。通过对PubMed、Scopus和Google Scholar数据库的全面检索，从644篇文章中筛选出28篇相关文献。综述结果显示，沉浸式技术，尤其是VR和AR，在创建数字助理方面发挥着重要作用，提供了广泛的应用场景，能在应对社交隔离、增强认知能力与痴呆护理、促进教育等领域为个人生活带来诸多便利。此外，AR和MR在提升虚拟伴侣技术背景下的生活质量（QoL）方面具有潜力。本综述的发现为这一不断发展的领域的进一步研究奠定了宝贵的基础。