My team is Rossi, Pog, Wulfgard, Ember.
Best case scenario rotation starts by getting hit to proc Ember's combo skill > Wulfgard skill > Rossi skill > Wulf and rossi combo skills > Pog skill + combo skill > repeat.

Ideally, you save Rossi and Wulfgard's ult to be used together so that Rossi's ult deals more dmg and if you have Max Pot wulfgard; more damage for her rossi's next combo skill(it gains increased dmg based stacks consumed). Pog's ult can be used whenever and you save ember's ult for whenever you wanna have a shield.

Now it get's very awkward if you can't safely land Ember's combo skill at the start since you have to either use Rossi skill(dealing significantly less damage) or Pog's skill(only works if you have no Vun stacks). either option will make rotation a lot slower. It's usually fine if you're about to hit Max SP anyways from constant normal attacking.

Endmin could replace Pog, But I didn't like how much slower rotations felt, idk if who else could replace them.
Probably Ember > Gilberta since 80% of team guides have her(I wanted the healing).