Who to upgrade next?

Idriv442

Can almost rank 5 a 4* champ, just not sure which one. Should I hold off until I can, or upgrade someone else?

PantherusNZ

Depending on her sig level, Scarlett Witch is going to see you through the most content because she's just a massive swiss army knife.
Venom is amazing to shut down evading spider-man characters who can give you a lot of grief - and he's a pretty amazing champ in general.
Thor has massive damage potential and is a solid boss killer for a long time.
Cap America WW2 is a solid, sustainable champ to see you through longer maps thanks to his block proficiency preventing him from losing so much health by getting chipped away.
Star Lord also has great damage potential, provided you can maintain his combo and not get hit.
Wolverine is another sustainable champ thanks to his regeneration.
Void, if you can awaken him, is an amazing champion and can shut down or even reverse regeneration.
Colossus is getting buffed soon - details TBC but it's looking like he could be really great.


Specifically for your first R5 though I'd say Scarlet Witch.