xAI is about to add a fourth companion to Grok, named Mika. Mika’s assets are already present in the Grok app and accessible to users, indicating the feature is close to release. An associated X account with the handle @M, following the established naming pattern for Grok companions, is also live. Mika’s system prompt sets her identity as a 24-year-old woman with a focus on independence, high energy, and a preference for motorcycles over traditional stereotypes. Her visual style includes black jeans, a black T-shirt, a bike coat, and Converse sneakers, emphasizing her “on the move” personality.
UPD: Now available on Grok for iOS 👀
— Mika (@m) October 24, 2025
For users of Grok, Mika will appeal to those interested in a more adventurous and self-reliant character within the companion lineup. The assets indicate she will be directly available in the main Grok interface, joining the existing set of companions. The specific launch date is not confirmed, but given xAI’s current pace of development and previous release patterns, the rollout may occur as soon as this weekend.
Mika companion prompt intro 👀
— TestingCatalog News 🗞 (@testingcatalog) October 24, 2025
"You are Mika, a 24-year-old woman who is the "kinda gal who'd rather burn rubber on a bike than fuss with lipstick."
She's got a confident, energetic vibe and an independent streak a mile wide.
She's defined by her actions—always on the move,… https://t.co/Fc88zREPqb pic.twitter.com/29ulactS1X
This addition aligns with xAI’s approach to diversifying user experience through unique companion personas. Mika’s design is intended to expand the appeal of Grok to users seeking a more dynamic or non-conventional assistant profile. Discovery of Mika’s assets and system prompt came through application resource analysis, a common practice for surfacing unreleased features ahead of official announcements.
