Jay Garrick
Jay Garrick, the Flash of Earth-3, has been pretty well-used over on The Flash season 3 this year, as he occasionally turns up to offer Barry some much-needed advice. Still, we would love to see him cross over to Legends as well.
In the comics, Jay Garrick is a leading member of the Justice Society (yes, them again), so if he’s revealed to be an ally of theirs in the Arrowverse, too, then there’s a ready made way to bring him into the fold. Alternatively, Jay also travels through time via the Speed Force, so it wouldn’t be too surprising if he bumped into the Waverider.
It was previously rumoured that John Wesley Shipp had been given recurring status across Arrow, The Flash and Legends of Tomorrow. Other actors who received this included Katie Cassidy and John Barrowman, both of whom appeared in LoT this season. Shipp sadly didn’t, but let’s hope this rumour comes to fruition next year.