Given the abysmal non-likelihood of Fantastic Beasts 4, Newt Scamander's return could happen in the Harry Potter reboot thanks to a 20-year-old Easter egg. Eddie Redmayne's Newt first appeared in 2016's Fantastic Beasts and Where To Find Them. This primary installment saw great success, bringing in four and a half times its budget at the box office. Following this, two films were released, Fantastic Beasts: The Crimes of Grindelwald and Fantastic Beasts: The Secrets of Dumbledore. Both saw less commercial success than the original, likely because of the narrative shift away from Newt's adventures to find and save magical creatures.
https://screenrant.com/fantastic-beasts-4-harry-potter-remake-newt-scamander/