Schultz was a character on the sitcom Quirk Girl. He makes his first and only appearance in "Estranger Things".
He was voiced by Max Greenfield.
History
When Quirk Girl returned home to see Schultz that he bought a dog, he told her that he just borrowed a dog to meet ladies, but the dog suddenly bites his finger-quote fingers. He then runs off to recover his fingers.
Behind the Laughter
Quirk Girl is parodying the sitcom New Girl where Max Greenfield played Schmidt.