Stefano Kartkowski, whose nickname is Teff, is a 16 year old Polish boy that attends the Central Square Academy. He was raised by his mother Kasztanka and grandmother Michaline from a young age due to his father leaving him at 4 years old. Due to this, he is able to speak Polish and English, and has more general knowledge on girls. His main interest is football, however he personally doesn't desire to play it, but to have knowledge about it.