How do you create this anime texturing/shading/particle stuff

I was watching magic barristers and was wondering how they obtained this weird 3d anime look.
Did they paint the characters or shade them in some way with sketch and toon shaders?
in the series sometimes there are really bad looking 3d elements comped into drawn elements, but whenever this effect where particles fly all around is used it seems to be actually hand drawn objects, but they move like 3d elements. This confuses me.