Journaling can potentially serve as an effective method for autistic adolescents to improve narrative skills. However, its text-centric nature and high executive functioning demands present barriers to practice. We present Autiverse, an AI-guided multimodal journaling app for tablets that scaffolds daily narratives through conversational prompts and visual supports. Autiverse elicits key details of an adolescent-selected event through a stepwise dialogue with peer-like, customizable AI and composes them into an editable four-panel comic strip. Through a two-week deployment study with 10 autistic adolescent-parent dyads, we examine how Autiverse supports autistic adolescents to organize their daily experience and emotion. Our findings show Autiverse scaffolded adolescents' coherent narratives, while enabling parents to learn additional details of their child's events and emotions. Moreover, the customized AI peer created a comfortable space for sharing, fostering enjoyment and a strong sense of agency. Drawing on these results, we discuss implications for adaptive scaffolding across autism profiles, socio-emotionally appropriate AI peer design, and balancing autonomy with parental involvement.

翻译：日记记录可能作为一种有效方法，帮助自闭症青少年提升叙事能力。然而，其以文本为中心的特性及较高的执行功能要求构成了实践障碍。我们提出了Autiverse，一款面向平板电脑的AI引导多模态日记应用，通过对话式提示和视觉支持为日常叙事提供支架。Autiverse通过与可定制的、同伴式AI的逐步对话，引导青少年提取其自选事件的关键细节，并将其组织成可编辑的四格漫画。通过对10组自闭症青少年-家长对子开展为期两周的部署研究，我们探究了Autiverse如何支持自闭症青少年组织其日常经历与情绪。研究发现，Autiverse不仅为青少年的连贯叙事提供了结构化支持，同时使家长能够了解到孩子事件与情绪的更多细节。此外，定制化的AI同伴创造了舒适的分享空间，促进了使用乐趣并强化了自主意识。基于这些结果，我们讨论了针对自闭症谱系特征的适应性支架设计、符合社会情感需求的AI同伴设计，以及自主性与家长参与之间的平衡策略。