Vanya and Harlan did initially have an emotional bond but this became more serious once he got powers.
When she is interrogated by the FBI, Vanya ended up releasing the huge protection bubble of energy.
This then caused Harlan to go into a trance-like state back at home, as if what she had an impact on his actions.
Vanya thought she took back all of her powers from him but the final moment showed Harlan playing with a toy bird floating above his palm, indicating this was not the end.
So are Vanya and Harlan now tied together forever through their powers?
The Umbrella Academy is available to watch on Netflix.