So many rank up options...

Crasyduck

I don't know who to focus on. I have a generic gem and a decent amount of sig stones for each class.

SpideyFunko

What rank are you taking them too? What sig is Void?

J0eySn0w

Caiw and Guardian

Etjama

5* Void (awakened)

Void's awesome. So much utility.

Crasyduck

I rank (and sig) that out because each are different rank and I don't want individual rank to affect how people vote (if it does at all).

AATT

5* BWCV

I never skip BWCV's final animation , what a gorgeous woman

Bleed/poison/incinerate immune, power gain, nullify, life and power steal, extra energy damage, diss track counter, and so on.

She can counter though nodes and saves you many pots. I prefer her above other listed options.