I think those all ideas from shows you've listed, unless have Ash put in diaper by pokemon, like for example like this
https://www.deviantart.com/feliciame...achu-357358328
BTW, are you ok with using girls just a minor characters laughng at someone? Say, Tails puts Sonic in diaper and drives him in baby carriage into the park and Amy, Rouge and Cream see him and laugh at him?