6) Pied Piper (As An Ally)
The Pied Piper is one of the more interesting members of The Flash’s rogues gallery as he is not always an out and out villain and has become an anti-hero and even a full-on ally of the hero’s in the comics.
The character’s journey was echoed in the show this year, when Barry’s tinkering with the timeline resulted in Hartley Rathaway becoming a better person who’s on good terms with Team Flash. We haven’t seen him since then, however, so next season it would be nice for the character to return as a friend, as per the comics, and actively lend a hand with his supersonic powers.
An important storyline in the comics sees Hartley framed for his parents murder, with Wally West’s Flash aiming to solve the mystery to free him. This would be a very easy story for the series to adapt and would also introduce the real killer of Hartley’s parents…