Sen tends to hang around empty city streets at night. She doesn't see a whole lot of people out (it is past midnight after all), but when she does, she's pretty excited about it. Someone to hang out with.

On the other hand, most people aren't too excited to see this giant whatever-the-fuck staring at them. Sen's excitement at a new friend is easily mistaken for excitement at an easy meal.

"Bicho Papão" is the name for the Bogeyman(or one of them) in Brazil, and Sen's Brazilian, so I thought it fit.