Look out when he is loading his salvo, use reversal and intentionally go into where he is shooting to maximize the reversal effects either at him or another enemy with lower HP to instantly kill them.
Torvald is able to regenerate his shield very easily from Willo's Seedling. Dead Zone affects him the least of all the tanks due to his self-healing abilities. Protection is an incredible at saving your allies from Seedling.
Never use seedling for androxus he can reversal up to 3187.5
If he is flying try to make him go near the wall so you can shot him easier
Try to note facing him 1vs1
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