This is my version of Suicide Squad. (Haven’t seen the movie yet.)
 
Princess Bubblegum is Amanda Waller (They both have an “ends justify the means” mindset).
 
Finn is Rick Flagg (They are the right hand man of a female leader).
 
Jack is Katana (They have a samurai code of honor).
 
Sniper is Deadshot (They are both expert marksman as well as mercenaries).
 
Pinkamena Diane Pie is Harley Quinn (They are both perky, cute, and crazy that hide a dark side).
 
Garble is Killer Croc (They are reptilian and have a hatred for those not of their kind.)
 
Flame Princess is El Diablo (They have fire powers and their emotions affect their powers).
 
Lightning Dust is Captain Boomerang (They are both selfish jerks who would leave their own to die.)