“[Mads Mikkelsen] brought a wonderful energy to Grindelwald. Wonderful maybe is not the right word, because it’s terrifying, but wonderful to watch as an actor. He brought a kind of menace to Grindelwald which is subtle, but scary, and he imbued the scenes with a powerful sense of authority and danger – you really don’t want to cross him. And he was also really great to work with personally.”
Source: Bearpost