User biography sections on digital social platforms (hereafter described as “user bios” or “bios”) are spaces for account holders to take narrative ownership in communicating their identities to other users and interlocutors. Online platforms, such as social media, are increasingly used as community hubs for disabled groups, and especially for autistic people (Author; Author; Sins Invalid, 2019). We focus on #Autisktok, one of many enclaves for autistic community building and cultural production on TikTok. Through a critical/cultural qualitative thematic analysis of #Autisktok user bios, we assess how the user bio mediates self-advocacy, agency, and autistic-centered knowledges on #Autisktok. To investigate how autistic TikTokers use their profile’s bio section as a space for “restorying” mainstream discourses about autism and agency, we draw upon M. Remi Yergeau’s (2018) work on autism and neuroqueer rhetorics and Arseli Dokumacı’s (2023) theory of micro-activist affordances, extending these frameworks toward the digital. We pose the following research questions: How do autistic youth use the bio section on TikTok to (re)story autism diagnosis? What is the user bio’s role in creating a supportive enclave for other autistic creators, users, and activists on the TikTok platform? Three themes emerged from our analysis: the explicit use of autism in the user bio, autism and intersecting identities, and the bio as a space for asserting agentic autistic selfhood.