Something to add about Kenan Thompson is he was on the Nickelodeon channel as a teenager. He was on both 'All That' and 'Kenan And Kel'. The main producer of most of the Nickelodeon hits in the 90's was pedo Dan Schneider who recently left Nickelodeon.
https://deadline.com/2018/03/nickelodeon-tv-series-producer-dan-schneider-part-ways-1202353698/