These two kids, the one on top being Skid and one on the bottom being pump, are originally created by a youtuber/animator Sr Pell. The series they originated from is called Spooky Month, sadly there are only 3 known episodes of it, the first one simply being called "It's spooky month". The first episode was made on October. I guess either Sr Pelo made FNF with NinjaMuffin or NinjaMuffin was inspired by Sr Pelo so Skid and Pump came to week 2 of Friday Night Funkin'.
