I use a team of:
Princess Fizzbang alone
I soloed the 3 dungeons with it.
I win a lot of PVP battle even against goblin team.
I win against top difficulty explores .
She fills herself and is 100% her own target, so after only a few turn you have +300 in all stats.
This troop is not balanced.
At first I used Elspleth, Boombots or the crazy dwarf to have her standing alone.
But down the line, it’s faster to just have her go alone.
In a scary way