Like many other New Zealanders, Thomasin is a proud Kiwi. After her big-screen role in the Oscar-winning Jojo Rabbit, she returned home to New Zealand for a break between films and to recharge after working internationally.
"I'm always going to come back to New Zealand, because we've got beautiful stories to tell," she told 1 News about her local acting career. "[I want] to support the New Zealand film industry in any way that I can." In the summer of 2021, she starred in the New Zealand film The Justice of Bunny King.