While most wrestling fans associate "Hat Guy" as the #1 ECW fan, right next to him at many Northeast ECW shows (including the ECW Arena) was "Faith No More Guy". His real name is Lenny Bonfiglio, and he even was mentioned on WWE.com's "10 most famous fans in sports-entertainment history":
https://www.wwe.com/inside/10-most-famous-fans
This quote is from the WWE.com page:
However, ECW Arena events still stand out as his favorite memories. “ECW was the best time of my life,” he told me on the phone. “If I could go back in time, that’s where I would go. We (the regular fans) all knew each other. There was me, ‘Straw Hat Guy,’ ‘Sign Guy’ and ‘Kato Kaelin Guy.’ Those were fun times.” For those of you wondering, Lenny now has short hair but is still rocking his goatee
You will see Lenny facing the camera in the front row of the ECW Arena crowd, in the same row as Straw Hat Guy, in this compilation video from WWE's YouTube channel:
This 2018 interview with Lenny goes more into detail about his time as a fan at the ECW Arena:
At the ECW Arena,there were great guys like Mike Johnson,Hat guy,Sign Guy,Dreadlocks,The Bubba Ray Dudley guy,The "Kato Kaelin" guy plus many more regulars...all good guys..all made an arena show fun even before the show started.
Again so many but among themthe top moments for me would definitely be the Guerrero-Malenko Wars...some of the best matches, The Dreamer-Raven feud was great too and the BEST moment for me was the first PPV Barely Legal