During December 2025, Zay Rex focused on backend maintenance for the SengokuCola/MaiMBot repository, addressing a critical bug in the emoji emotion parsing subsystem. He implemented a Python-based solution that normalized delimiters by replacing Chinese commas with English commas, ensuring consistent and accurate emotion parsing across diverse input formats. This approach improved the reliability of the emoji system and reduced parsing edge cases, directly enhancing downstream analytics and user experience. Zay applied his skills in Python, data parsing, and error handling to deliver a targeted fix, maintaining clear documentation and commit history to support future maintenance and repository stability.