A new report from EW claims that Carter Hall a.k.a. Hawkman will be introduced to both CW shows in their coming seasons to provide some context, before (presumably) helping Kendra (Ciara Renée) take on the mantle of Hawkgirl in the Legends of Tomorrow spin-off.
From EW’s character description; Described as charismatic and wise beyond his years, Hawkman is a natural-born leader with an abundance of charm and confidence—well, that’s because he’s 5,000 years old. Much like the comic book iteration, Carter retains his memories of his past lives each time he is reborn, though his lover (aka Hawkgirl) is born anew. In other words, Kendra Saunders will have no idea who he is at first.