If there come more seasons of "DC's Legends of Tomorrow", which Heroes from "Arrow" and "The Flash" can become Legends?

My ideas are:

- Katana/ Tatsu Yamashiro

- Huntress/ Helena Bertinelli

- Question/ Victor Szasz (as Huntress partner)

- Arsenal/ Roy Harper

- Vixen/ Mari McCabe

- Firestorm/ Ronnie Raymond (if he come back)

- Wildcat/ Ted Grant

- Curtis Holt/ Mr. Teriffic