Who Should I Rank 2?

Legotb27

I have Doom, Shang and Fury at rank 2
And these are all my rank 1s

Caleb1705

Kingpin

Kingpin has great damage output and utility, plus a very open and easy playstyle. Personally I'd put Falcon at a close second, but with your current roster progression you should be looking at who is going to best compliment your 5* roster while questing (ie. Sentinel is a really useful champ unless you already have a 5* OmegaS, Nimrod, Warlock, etc. ranked up)

Ortoun

Venompool

I love kingpin, he was my first r5, but that said, you already have a couple skills ranked, VP is a great counter for a lot of annoying tech champs. Is one of a very limited pool of champs that can remove buffs that doesn't count as a nullify/fateseal/stagger, and is fairly sustainable as he can heal a decent amount from eating armor ups, so is amazing for nodes like explosive personality or turtling.