Katsuhiko Teshigawara

Katsuhiko Teshigawara is a close friend of Mitsuha's. He is an expert with machinery. He, along with Sayaka, were the only people that helped Mitsuha with her plan to save the town people from the comet.

Towards the end of the movie, it is shown that he and Sayaka are in a cafe where Taki is. They're having a conversation about wedding, possibly for them.