Could someone shortly explain me in what relationship they are ? :P

Looterking said:

Could someone shortly explain me in what relationship they are ? :P

late:
Not sure about the lore but, in the game this is a very common team-up.
Pharah blasts people from above while Mercy sticks to her and heals.
Their abilities kinda synergyse too, like if Pharah flies off, Mercy has an ability that allows her to follow.
See post #2393067