Which character from the Mega Man series made a small cameo on Volt Catfish's introduction scene in CD versions of Mega Man X3?

The character from the Mega Man series that made a small cameo on Volt Catfish's introduction scene in the CD versions of Mega Man X3 is Auto. Auto is a helpful robot character who assists Mega Man throughout his adventures, primarily by providing weapon enhancements and upgrades. In the scene mentioned, Auto briefly appears near the beginning, showcasing his signature cheerful and animated personality before allowing the main focus to shift back to Volt Catfish, one of the game's boss characters.