User blog comment:ChishioKunrin/Why the introduction of ABRN is not a bad thing/@comment-10380701-20150822122412/@comment-4010415-20150822232824

They might list off aspects of these characters to the animators and work with them to put the personality in the characters' fight scenes. I think at one point in the panel, they said that they actually write stuff that they want included in a fight scene in the script, so the animators will include important details that they want and will also fill in the gaps by suggesting or discussing their ideas.