Agatha All Along's unnamed 'Teen' is probably this familiar Marvel Comics character
Briefly

The character's real name has not yet been stated, keeping his identity a mystery that Katie Hahn's Agatha Harkness seems to be intertwined with.
Billy Kaplan, also known as Wiccan, is a key Marvel Comics character with the ability to warp reality and has a magical destiny tied to him.
Despite being kept secret in the show, strong hints suggest the character played by Joe Locke is indeed Billy Kaplan, the fan-favorite young superhero.
The show presents Teen as a young male witch with a boyfriend who possesses the magical ability to break through Scarlet Witch’s illusion.
Read at Polygon
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