Don't need any dupes and I don't recommend getting any even if you have a V6 Klukai because before V6, her dupes only buff her personal damage.
If you can get V6 then I assume you are in a top 100 guild and want to push gunsmoke scores.
A strange rework but a good one.
Everything about her is automated now. She has 100% uptime on her corrosion amp, 30% AoE assist boost and turbo mode.
She also has global range, damage ramp up with 2 attacks per turn (3 at v3) so she can do some decent damage.
But of course nothing comes for free, in this case she cannot move and if you ever want her to move you will have to trade all the previously mentioned upsides and go back to boring old mechty.
Has synergy with Lind fixed key, removing any trade-off you pay for global permanent 15% def down. Just remember to start the turn with her so you get the corrosion amp first.
Overall a great rework for the red bull devil.