Who should I upgrade?

This is my roster, who should I upgrade?
I am stuck on 6.2.3, that Icarus node is annoying.

Comments

Titania, Nefaria, Colossus, Scorpion, Chavez, Rogue and Blade; in that order

Who out of those should I rank two, and who should I rank three. I think I could rank four nefaria with the gem from the event.

you should rank up that kate immediately, she carried me to paragon

It'll take me a few weeks to get the t5cc for Kate, but I could do that.