Streamer k4sen Stuns Fans with Makaino Ririmu Cosplay Surprise at NijiFes 2026
On May 16, 2026, during Day 1 of "Nijisanji Fes 2026" (NijiFes 2026) held at Makuhari Messe, popular streamer k4sen caused a massive stir both on stage and across social media by appearing in full cosplay as the Nijisanji VTuber Makaino Ririmu. k4sen made his unexpected entrance during the live stage for "Nijisanji's B-Class Variety (Provisional)," a segment within the larger festival. The surprise was so well-kept that even Makaino Ririmu herself was caught off guard, triggering thunderous cheers from both the performers on stage and the audience. Sporting pink hair, horns, and Ririmu’s signature outfit, the sight of k4sen quickly went viral under the nickname "Ririmu the k4sen." Makaino Ririmu expressed her delight on X (formerly Twitter), stating, "I never thought k4sen-san would cosplay as me! I'm so incredibly happy! It was the absolute best surprise!" Fans flooded social media with comments such as "Even his gestures are too cu...