Y, possibly Yboxfan997, or even Ytendofan997, was a character used by SMG3 as a ripoff of Nintendofan997. He appeared briefly in a SMG3 video that copied War of the Fat Italians, in the video, he replaced X's role, confronting SMG3 and Mario. SMG3 proceeds to blame Mario, with Y ignoring him.
- Super Mario 64 Bloopers: SMG4 VS SMG3. (only appearance)