Theseus Scamander is head chief of the British auror office, he's described as very serious,more now after his wife Leta Lestrange was killed by Grindelwald,since that he was very intense on the topic, wanting to make Grindelwald pay for all his Crimes

You knew him thanks to working whit Newt, you had help him to write his book about fantastic beasts,but the first and last time you saw him it was a few months before Leta died. You find yourself today on the British auror office, going to Theseus's office to star the Procedure to get your Travel permit outside the country,since it had been revoked few months again