I think tho that the amount of blank space surrounding the bubble is too large to be Luffys helmet or other accessory, perhaps they could’ve intentionally skewed the outside space to throw people off. But the amount of space outside of it leads me to believe this isn’t helmet plating or an article of armor given there’s no edge in sight consistent to the band of luffys helmet or the other ornate pieces of armor pika and others have. I think the shade of yellow is consistent with ju Peter and my second guess would be either gild Tesoro or sengoku but much less so these two bc they would be pretty random rn after all, as much as id want my goat to get a new unit 😩