Which champ should be my 1st Rank 2 in 7 star

Predator_41

Please someone help me choose which champ should I rank 2.

Sairam44

Hulk or red skull

Badabibidon

Hulk, Elsa, warlock.
If you have 6* Ultron do warlock for that synergy
If you need a solid bg's defender, do Elsa
If you need a powerhouse all-game modes attacker, go hulk

Warren_pain

Hulk