JJK Yuji Cosplayer Arrested for Attacking Sex Offender at Event

A Yuji Itadori cosplayer was arrested after attacking a criminal named Amos Yee at an anime convention in Singapore, drawing worldwide attention and massive reactions on social media. The incident happened during a pop culture event, raising discussions about safety, behavior at conventions, and the boundaries between real life and fandom.

JJK Yuji Cosplayer Arrested After Attack on Amos Yee at Anime Convention in Singapore and the Repercussions of the Case

The episode happened outside Doujin Market 2026 in Singapore, where an 18-year-old teenager was reportedly detained by police for causing public disturbance after assaulting a 27-year-old man identified as Amos Yee.

According to local reports, the situation unfolded during the crowded event held at the Suntec Singapore Convention and Exhibition Centre. Witnesses stated that the confrontation started outside the main halls and quickly escalated, attracting the attention of attendees and security staff.

As we can see in the video above, from Amos Yee’s point of view, the Yuji cosplayer is standing behind him watching while Amos is talking, and suddenly the camera drops before the attack happens moments later.

There are also photos showing the Yuji cosplayer on top of Amos, apparently assaulting the man.

According to Yee himself, he had been banned from the convention after complaints and concerns were raised by attendees. Even so, he remained in the public area outside the ticketed sections of the venue.

Although Singapore police have not officially released the suspect’s identity, fans identified the teenager as a cosplayer known online as John Cosplayer, also called “kay9,” who was dressed as Yuji Itadori during the assault.

Doujin Market organizers, Neo Tokyo Project, released a statement saying they had canceled the ticket of a “problematic influencer” and were taking steps to prevent him from attending future events. However, they emphasized that they do not support violence of any kind.

Under Singapore law, causing public disturbance can result in fines of up to S$2,000. Physical assault can lead to up to three years in prison in addition to fines of up to S$5,000.

Apparently, the attack was motivated by the fact that Amos Yee had previously been convicted for grooming a minor and possessing illegal material.