Suggest me some useful counters

Hi friends, iam new to this game and as iam not perfect in maintaining combos so long and can't perform complex fights right now.
To win fights in boss rush events and other side quest,suggest me useful champs to counter enemies..... For example THING is very difficult to beat but SHEHULK makes it possible with her heavy attack by placing a slow debuff.

Like this suggest me useful champs from below so i can rank up them to max......

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STARKtech

Warlock, Medusa, AA, GP, KM and Ghulk are pretty good. Focus on them.

I have ghulk and KM as 5 stars.
But what abt emma frost is she useful anywhere.

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dot_ditto

I'd say Archangel is your top priority ... that thing will wreck stuff for you.

Followup with Luke Cage, and Gwenpool ... she's easier to use the Killmonger, and has some nice utility that'll get you going until you get to your 5*s ... at that point, ignore your 4*, and start focusing good 5*s ..

Denslo500

Warlock counters
- Thing: use heavy for the bleed
- any healer or healing node (masochism, etc)
- coldsnap
- havok (has armor up)
- bleeders or bleed nodes
- poison nodes
- power gain (sp1 drains)
- armor (armor break sp2)

He is your highest yield counter option.