The Most Amazing Cosplay of San Diego Comic-Con 2026, Day 4

San Diego Comic-Con 2026 featured a highly discussed samurai ronin cosplay that captured the community's attention throughout the weekend. Additionally, Billie Joe Armstrong from Green Day made a surprise appearance at Gallagher Square outside Petco Park. The singer performed the hit song Basket Case from a pop-up ice cream truck to promote the upcoming coming-of-age rock comedy Nimrods, adding a musical highlight to the event's festivities for the gathered crowds.