I got this idea from the AU [The Basics of Education, a Baldi Undertale AU, where Baldi Is Chara, and so on, here's a list of the characters, credit to the Soundcloud Artist Yecks and credit to Yecks ( again ) for what roles each character has.

[The Basics of Education]

Mr Baldi - Chara (Baldi's Basics)
Mrs. Playtime - Frisk (Baldi's Basics)
The Creativity Notebook - Flowey (DHMIS)
Ruff McRuffman - Toriel (FETCH! with Ruff McRuffman)
Bill - Napstablook (School House Rock)
Digit - Sans (CyberChase)
Wordgirl, Super WHY, Maya y Miguel - Papyrus (Wordgirl)
Spongebob - Monster Kid (Spongebob Squarepants)
molly macdonald - Undyne (Arthur)
Mr.Peabody and Sherman - Alphys
Steve - Mettaton (Blue's Clues)
Tͣͣ́h̶̷̽ẻ̲̀ Ć̊̓h͗̐ͅi̶̧̦l͕͑͡d͎̒̑r̩̒͑ḙͤͤǹ̤͍ o͕ͥ͡f̋̕͝ Z̼͙͗a̢̨̳l̙̐͆g͋̂o/T̸̛͛h̲̟̅è̟̮ H̡̞ͨi̻̘͞ḑ̠ͭd̷̻͋e̠̊̒n̛̲ H̛͌͠o̾͡r̲͆͗ŕ̭ỉ̷̞dͫ̓ͅ T͉̦̅o̖̾o̰̺͂n̷̾ͧs̛̗͢ (Lost Episodes) -Amalgamates
Mr Roger - Asgore (Mr Rogers Neighborhood)
Bootleg Spongebob - Goner Kid (Lost Episodes)
Candle Cove/Mr Bear - Gaster (Lost Episodes)
Elmo - Asriel (Sesame Street)
Clifford - Annoying Dog (Clifford)
The Entire Dinotrain - Riverperson (Dinosaur Train)