Finding out that Stick taught Elektra made me wonder who else he taught and thought it was a good way to do a crossover. Examples could be:
Supernatural Crossover- one time when John is away Stick comes across Sam and Dean and whenever there Dad is away would train them.
Harry Potter- Stick finds Harry on the doorstep in Private Drive and takes Harry.
Or you could have a story where the child in question in already grown and the training with Stick is a secret from their childhood. The character you choose doesn't have to be good at fighting in their canon but could be in this for example you could have Wally West from The Flash tv show being targeted for his want for a Father figure and his recovering addict Mom not always being the most stable of figures (and it amusing to think of Joe's reaction once they find out).
Apprentices of Stick
Supernatural Crossover- one time when John is away Stick comes across Sam and Dean and whenever there Dad is away would train them.
Harry Potter- Stick finds Harry on the doorstep in Private Drive and takes Harry.
Or you could have a story where the child in question in already grown and the training with Stick is a secret from their childhood. The character you choose doesn't have to be good at fighting in their canon but could be in this for example you could have Wally West from The Flash tv show being targeted for his want for a Father figure and his recovering addict Mom not always being the most stable of figures (and it amusing to think of Joe's reaction once they find out).