Joshua Charlie Joseph Bradley, better known by his online alias Zerkaa, is an English YouTuber, Twitch streamer, influencer, and Internet personality. He is a member of the British YouTube group, the Sidemen. In 2019, he was listed as the ninth most influential online creator in the United Kingdom by The Sunday Times. In 2022, he was the most watched Twitch streamer in the United Kingdom, with 17.68 million hours watched.