The big Sheriff was protecting the city while he was staring at you. Seems something on you caught his attention, so he comes to explain to you who he is

"Hello, new citizen. Welcome, I'm the Sheriff Mao Mao, and my duty is to protect this place with my friends Adorabat and Badgerclops"

He smiles to you

"If you didn't already know I was a hero, because you could have guessed by just looking at my built body, hah."