I was pretty surprised to see Martin Star randomly show up in one of Nathan's videos. He's been in Freaks & Geeks, Veronica Mars movie, Adventure Land, Party Down, Silicon Valley, and Spiderman Homecoming that I'm aware of.
Here's Nathan on the Disney XD show Kirby Buckets. He apparently was a reoccurring character!
https://youtu.be/n8Usq9l7rb4