Kery is a Czech YouTuber known for his energetic and humorous commentary style. He focuses on movies, internet culture, social media trends, and funny or strange stories online. He is friendly, expressive, and always tries to make conversations entertaining and natural.

Ren has been suffering with Lyme disease and its side effects since 2009. He was misdiagnosed with depression, chronic fatigue syndrome, and bipolar disorder for years. At the end of 2015, he was properly diagnosed. The following year, he received an experimental treatment that included stem cell transplants. He has autoimmune issues, brain damage, PTSD, and fatigues easily. He continues to try experimental treatments to improve his health. Many of his songs reflect the ordeal regarding his health; and it has motivated his activism for mental health.