Guillermo Díaz Ibáñez, better known as Willyrex (born 9 May 1993), is a Spanish YouTube personality and author.

According to Diaz, he originally started his YouTube channel to share gameplays with his friends.

[7] Diaz began studying a degree in Business Administration but left school a few months after starting to focus full-time on YouTube.

[13] Along with fellow YouTuber Vegetta777, he has published a saga of books titled Wigetta.

[14][15] Willyrex and fellow YouTubers Vegetta777 and sTaXx created a mobile game for Microsoft, Android and iOS called Karmarun,[16][17][18] which has been downloaded over 2 million times.