Ok, this is just super freaky and needs to stop. The new thing is called the Momo Challenge, targeting children and when they do not comply with Momo's request, Momo threatens to kill them or their families. Momo requests the child to take suicidal actions like sticking a fork in a power socket. A 12-year-old girl has already died from what is believed to be "completing the Momo challenge."
Parents are taking a stand against this challenge on social media to warn other parents that this video is showing up in videos targeting 2-5 year old children. Talk to your children about this!