Teen is actually Nicholas Scratch

Of course, Marvel has tried to fool viewers before, and Locke’s Teen could be no different. The show could be using the obvious Billy hints as a cover for who Locke actually is: Nicholas Scratch. We’ve caught glimpses of Scratch’s presence in the first few episodes of Agatha All Along so far, suggesting he is Agatha’s dead son. In the comics Scratch is indeed Agatha’s son, and a powerful magic user in his own right.
Scratch also has a clear connection to the show in the form of the Salem Seven, the coven hunting down Agatha. In the comics, the Salem Seven are the children of Scratch, who has it out for his mother. Agatha and Teen are already beginning to form a begrudging mother-son dynamic and it wouldn’t be shocking if the show reveals that they are in fact mother and son. But with Scratch’s comic past, if Locke is Scratch the question becomes: is he secretly the villain of the show?