None of those are really the top tier skills for Act 6 and 7 (Nick, Aegon), but they will certainly help in some paths. Probably not in Map 6 AQ though. BWDO is great for the Cav EQ and Elsa isn't bad too
Elsa - amazing for cav eq skill node, act 6 and 7. The easy openings, evade counter, shrugging of non dot debuffs, direct damage and a lot of debuffs make her extremely useful in a lot of scenarios
Kingpin is amazing , great damage , highly sustainable if you use willpower (which you should have no matter what) if you use good you can be debuff immune , very strong aar reduction on sp1. Overall he's a package and would help you a lot more than other champs.
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Falcon at r2. Soon to be r3
Just looking at my rank up options
The easy openings, evade counter, shrugging of non dot debuffs, direct damage and a lot of debuffs make her extremely useful in a lot of scenarios