Yep. The last solar girl was Mimulus. But sadly, Solar Drive is no worth it as it's far far below Crit. Actually, almost everything is far far below Crit. They have done so much girls with insane +40%~+50% Crit dmg, it's "easy" to make full Crit teams able to destroy anything.
Why would you build a Sun team able to to large amounts of damages one time when you can stack crit and do insane damages every turns?

I like Solar Blast as much as I like Crit but SB is only worth it on the Whale Ship now.

The best output damage is hard to say. It depend of your team total power. And the max SB bonus is +1420% SB dmg. I guess you can expect something between 1M and 2M damages. But I don't have a full SB team to test it.