How is this animated graphic style called and how can it can be copied?

How is this animated graphic style called and how can it can be copied?

Does someone how this animated graphic style is called? Also any clues on how to copy it to some extent?

This video is full of it, but you can jump to 1:23 to get an example

https://www.youtube.com/watch?v=PtGFIrvtiAs&list=FLr0iCYCKVgSw1MxIX2wAdv...

or this one at 5:40

https://www.youtube.com/watch?v=jvLzA2_EEL0&list=PL9yU1MTXPxvabDdUThGytX...

Another sample:

https://www.youtube.com/watch?v=VlLHuAcyVAg

 

I can see some cg involved but i fail to grasp anything else.