Headcanon that Mauler the Kneazle is grumpy and hates everyone but Tina. He will hiss at everyone except for Tina - he’ll tolerate Newt sometimes but only because of Tina. Whenever he’s around Tina, Mauler is as docile as a kitten (pardon the pun), and she gushes over him.
“Oh he’s lovely really…”
“Tina, dear, he tried to swipe me.”
“Psh you probably deserved it.”