Villains i want to return or be introduced for season 7 of The Flash.
Rival (Edward Clarris)- We need the rival back especially since Jay Garrick will be in season 7. This would be cool to have JG vs EC fight as they did all the time in the early comics
Reverse Flash(Eobard Thawne)- NO EXPLANATION!
Zoom(Hunter Zoloman) -After Barry gets the Artificial Speed Force, he could time travel to have a better understanding of Earth Prime's new history which would be where we see Zoom.
Fiddler(Izzie Bowin)- I want to see all the other Bus-Metas return as we know from Cisco's binder that Null exists and is alive on Earth Prime.
Matthew Norvok- After we learned that Norvok is alive from Amunet Black, i want them to retcon his name to Hunk Norvock like in the comics
Shade- since we only got to see shade in one scene in season 3, they should bring him back for season 7 as he could probably have his powers expanded and introduced us to the shadowlands and shade could probably be a pretty interesting explanation to Crossover with Star Girls universe.
The Thinker (Clifford Devoe)- same answer as Zoom
Gorilla Grodd- since Grodd merged with Barry in season 6 episode 13, it would be interesting to have Grodd turn bad again but to steal Barry's Speed
Captain Boomerang (Digger Harkness)- as true arrowverse fans know, they underutilized Captain Boomerang on Arrow, so four words (bring Captain Boomerang back)
doctor Alchemy- like they did with doctor Light, bring Julian Albert back but make doctor Alchemy and him a separate person
Mirror Master (Sam Scudder)- they really need to bring back Sam Scudder the OG mirror master as it would be pretty cool to have him and Eva McCullough have a duel. It also makes sense as top will be in season 7
Trickster (Axel Walker/James Jesse)- they should really bring back both tricksters as Axel Walker hasn't appeared since season 4, and James Jesse hasn't appeared since season 2.
Weather Wizard (Mark Mardon)- since weather witch was in season 6, they should bring weather wizard back to reunite them
Rainbow Raider (Roy G. Bivolo)- we have to bring him back as he has not been seen since season 1
Kilg%re (Ramsey Deacon)- same reason as Fiddler
Hazard (Becky Sharpe)- they could bring her back but they could get rid of all the tender parts of her which will make Berry remember about all the changes post-crisis.
Black Bison (Mina Chaytan)- They could bring her back for a flashback)
Folded Man (Edwin Gause)- for season 7, I think that they should do an Acolytes of Zoom storyline as folded man was a part of the acolytes of Zoom team
Black Flash- With the artificial speed force almost done, it would make more sense to bring black flash back as he is a grim reaper for speedsters
Gider (Tony Woodward)- they showed him in the binder of Cisco, so I feel like it's foreshadowing for the first 3 episodes
Plunder- same reason as shade