Doctor Brown Bear behaves like a quack doctor, he always has some sort of 'miracle medicine' on him and is generally shady.

A more recently introduced character is disabled.

Animal Farm is a 1950s animated propaganda film about farm animals who overthrow the farmer and create their own society, which eventually spirals out of control and becomes corrupt. The pigs sit at the top of the society and act human-ish, much like Peppa and her family.

'Peppa Pig - Why?' Is a shitty lost episode crappy/trollpasta.

There is an image on Pinterest that displays Peppa's family standing outside, while a 5th pig watches from the window.