Fourth picture in OP looks like a garden gnome.
I can assure you it is a cat.
Misread title as "Cats standing up for people" and expected thread to be about kids getting bullied and their pets intervening and attacking the bully
It would not surprise me if that has happened before. Cats are known for their tendency to dish out justice at a moment's notice.
I would like to thank you for filling my mind with images of cats beating up bullies. Here is a token of my gratitude.