AA, Moleman, Venom, Corvus are good calls! if yo ucan awaken AA you should, even at sig1 he is a monster.
Corvus, Cap Marvel, Molegod, Archangel, venom, namor, Stark Spidey
Best advice I can give you is go on Youtube, search each Act chapter for "easy path" and get prepared. You need a variety of champs to face different types of noes and fights that can be show stoppers if you don't have a counter. From what you have to work with right now:Magik is still a beast for power control and doesn't need the dupe. G2099 will cover your bleed/poison paths, help with Masochism, work ok for heal control and be a strong damage dealer once she's ramped up if you keep up with the SP3 finishing moves and don't lose her combo. She doesn't need the dupe.AA is amazing, but really needs the dupe for the Ability Accuracy Reduction, so I would hold on him for that unless you find he's really needed for the regen control. He is a game changer for sure though (once duped).Hulk Rags might be a way through some of he nasty damage paths (face me - Magik counter, Terrax counter, some nodes). Unfortunately, you're missing a good incinerate/cold snap counter (warlock, colossus, torch... runner ups Void, Mephisto). You also need some armor up champs (most techs / Colossus) to counter Havoks. Venom can work for him if you get the armor up buff early. G2099 can cover those, but can be a little risky for losing combo. Or, keep him power locked/drained with Magik, but that's not as easy as just having an armor up buff.Ideally, for the 6.1 bosses:Sabertooth: Warlock or anyone who can heal block/reverse. Someone who does lots of burst damage or DoT (Nick Fury), but this fight can catch you if he out heals your damage. Venom should be OK if you get good bleed RNG and throw lots of SP1Ultron - Red Magneto, Medusa or Nebula work well. Technically you can use anyone, but if you put a debuff on him (parry) it can be lights out real fast. You might be better off just using a burst damage champ to whittle down and never parry at all - take the block damage. Ghost - nothing special for this oneLoki - torch / void, but you can use a good DOT champ tooCrossbones - a strong poison immune champ - warlock is amazing, iceman... your rhulk should work, but class disadvantage so it will be a long fightSentinel - hammer away - he's stun immune though so not as easy to crush with Magneto. Medusa, nebula are good options. A void or prefight torch can work well after you survive the debuff immunity phase and can start applying DoT.With your current roster, I wouldn't rush it. Take your time, have fun, collect some other champs along the way and assess again. For now, study Youtube and prep your runs.