Picking Androxus is a good idea to counter willo
Her seedling with legend card can do 4250 if you use reversal you can do 4250x0.75=3187.5(more than her maximum health)
It's difficult for she to hit you while flying
If Androxus tries to flank and kill you, be careful where you shoot. If he uses Reversal, you can try to shoot behind him and use splash damage to kill him since reversal only takes damage from the front and Androxus can't shoot while in Reversal.