Gonzalo Raúl Barrios Castro[2] (born April 17, 1995), known by his gamertag ZeRo, is a Chilean professional Super Smash Bros. player and streamer.

His best known characters are Diddy Kong in Super Smash Bros. for Wii U, Pit in Project M, Meta Knight in Brawl, and Fox in Melee.

ZeRo retired from professional competition in January 2018 to focus on streaming and "close the chapter" with Super Smash Bros. for Wii U.

[11] In the following years, ZeRo regularly traveled between Chile, Argentina, and the United States to compete in regional and international Smash tournaments and events.

In 2012, he began competing in professional esports events including Apex,[13] By early 2014, it was estimated that ZeRo was earning approximately US$40,000 a year from a combination of prize money, sponsorships, and Twitch streams.

[15] In June 2014, he won the Super Smash Bros. for Wii U invitational at E3, moving up through the winner's bracket and defeating Hungrybox in the game's first-ever official tournament.

[20] ZeRo suffered from a growth on his middle finger in early 2016 that required surgical removal, and prevented him from playing Smash for several months.

[24] On July 3, 2020, ZeRo announced that he would be retiring from professional competition following allegations of sending sexual messages to minors when he was 19, and that he would also be ending all of his sponsorships.

"[30] After months of silence, on March 23, 2021, ZeRo's then ex-girlfriend Vanessa announced on Twitter that he had attempted suicide and was sent in for further care after being treated in a hospital.

[32] On November 16, 2021, ZeRo uploaded a video to YouTube, stating that he was returning to creating content and retracting his previous admission.