new Jyn is actually crazy with Leia

TLDR: constantly removing all turn meter from all enemies

you guys can check out Jyn Erso (Undercover)'s kit by going to her on the Journey Guide page or go to gg

Admiral Raddus unique ability has been updated to work with any version of Jyn Erso, and if both versions are present only Jyn undercover will get the bonuses

so her 2nd Unique ability will make it so that when she gains Spark of the Rebellion she will inflict Breach, Buff Disruption and healing immunity

the main thing is the buff disruption (reminder buff disruption is basically stagger + buff immunity)

so at the start of the battle, Admiral Raddus will give Jyn undercover spark of the rebellion (in GAC if you have her omi she will dispel it and Admiral Raddus will give it to her again) which inflicts the debuffs mentioned above

now because Leia will probably go first or second (probably first, breach gives -25% speed, only second if bonus turn), and she will always do the AoE, but because the enemies all have buff disruption it means that every enemy loses all turn meter

Jyn Erso Undercover special 1 in GAC also removes 100% TM from all breached enemies, and most of the time all enemies are going to be breached so it's also another remove 100% TM from every enemy

her unique 2 GAC omi also makes her lose spark of the rebellion more often (which means she'll gain it more often and apply those debuffs more often)

jyn erso undercover base speed is 188 plus the 30 from spark of the rebellion it's effectively 218 which is actually the faster than the fastest base speed of non-GLs in the game

the only problem with this is that Jyn undercover base potency is super low only at 31% so potency mods are wanted, although R2 stat sharing does help quite a bit, so does Captain Drogan's Keen Strategem