I think you made the right decision to ask for help here.
The first question you need to ask yourself before playing MPQ is are you willing to pay money?
If the answer is “no” as I expect in your case, the pressure on HP will always be very high irrespective of your level in the game. As a consequence, your strategy will be based on HP saving because you will always be frustrated to get rid of interesting covers.
If the answer is “yes”, expect to pay more than for a console AAA game, but you will progress faster and will have a more pleasant experience. In this case, you will invest your money in HP, and the scarce resource will be ISO.
I am assuming that you want to play for free because if it was not the case, you would not have asked your question, you would have bought HP. So, knowing that HP is the scarcest resource for you, the following question is what is the utility of each roaster level (number of stars).
1. The * level
As far as I am concerned, the 1* level has only two uses:
- Build a ** roaster;
- Play the Daily Deadpool Quest (DDQ).
I do not see any other use. To play the * level of DDQ, you only need Juggernaut 5/5 at maximum level (40). Nothing more for a daily 120-sec. quest.
To build a ** roaster, you only need Iron Man 35 5/5/3 around level 25, Juggernaut 5/5 at maximum level (40), and another character to complete the team such as Black Window 5/5 at maximum level or Storm or someone else. Everything else is a waist of HP and ISO because as soon as you have a good ** roaster, you will sell every * character except Juggernaut because you will need HP for your ** and *** roasters.
As a consequence you built a not-to-good * roaster because you have not Juggernaut, and you invest too much ISO in useless characters. Selling a character does not compensate the ISO investment.
So, your primary goal is to get Juggernaut fully covered at max level using a few nodes of the Story mode and, more importantly at your level, carrying out PVE and/or PVP quests. To do that, keep IM35 but cover him 5/5/3 when you get a Yellow cover because his Blue is almost always useless because its too expensive and you want to use BW Blue. Yellow is not so good either for IM35 because Strom Yellow is better but IM35 Yellow is still better than his Blue. Sell Hawkeye to make room for your roaster. When you have Juggernaut at a usable coverage and level, sell Storm and keep Jug, IM35, and BW until you have a good ** roaster. Then sell BW* and IM35, and keep Jug for the DDQ.
2. The ** level
According to me, the utility of a ** roaster is:
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Building a *** roaster;
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Playing quests where ** characters are mandatory;
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Playing the DDQ;
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Championing the characters to farm resources including 3 covers of a *** character.
To build a *** roaster and to play the DDQ, half a dozen of ** characters are sufficient. To play all the quests, you need all the ** characters and then you can farm with every ** championed characters. So, for a paying player, it might be useful to get all of them. But for a free-playing player, I disagree with everyone advising you to farm with every ** characters. I think that you better keep your roaster slots for *** characters and you better only keep 6 ** characters at most.
About farming, championing a ** character requires a total of around 100,000 ISO (or maybe less, I do not remember) while you will only farm between 17,000 and 18,000 ISO if I remember well, and you will sell him/her for only 65,000 ISO and 125 HP. You will see later in the game that a roaster slot costs 1000 HP from a certain point. So even if my ISO figures are wrong (I cannot remember the exact figures), the balance will not be graceful, and the HP balance is terrible. When HP is your scarcest resource, you understand that farming with a useful character is good, but keeping a character just to farm is a mistake. So, do not keep ** characters only for that purpose because there are other ways to cover your *** characters.
So, which ** characters should you keep? This is very debatable. My favorite 6 are Black Window 3/5/5, Thor 3/5/5, and Storm 5/5/3 for a slow but very powerful winfinite team for the wave and goon nodes, and Daken 3/5/5, Ares 4/4/5, and whoever you like as a third (Human torch, Magneto, Wolverine…) to complete a second team which is faster against moving-tiles enemies but which is not a winfinite team. Having two complete independent teams lets you to play the two ** DDQ without pause or without using health pack when you do not have much time.
A winfinite team if you wonder what is it is a team that can, from a certain point in the battle, launch a continuous stream of attacks, each attack feeding the AP for the next one till victory. You need time to prepare the winfinite part, but when you can start it, the game is over. That is why I use it for wave nodes but not for fast fights. The key of the BW/Th/Storm team is to use Green Storm when you have around 25 Green to gather AP, then use Thor Yellow and BW Purple if you can to get back the Green which can be used to gather Storm Blue, Thor Yellow, and BW Purple again… This is deadly due to the insane Storm Green that can gather till 30 AP + cascade for a cost of 12 Green.
BW is one of the best ** character that you will also use during the -to-* transition. So, keep her.
3. *** team
Same line of reasoning than ** team. Keep the 15 to 20 best ones, do not invest in the others.
4. Final piece of advise for your current roaster
Choose 6 ** characters and sell the other ones.
Regarding the *** characters of your current roaster, ranked from top to low personal preferences:
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You must absolutely keep: Iron Fist (fragile but so powerful, cheap powerful attack to trigger Kamala healing, board shaking, constant strong attack tile combined with strike tiles), Kamala Khan (good AOE damage, AP generation, and healing), Luke Cage (strong on offense and defense),
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Not top priority but useful: Black Panther (strong AOE damage, strong strike tiles, and stun, just a bit slow), Wolverine (true healing but his attacks fire back, so dangerous), Doctor Doom (slow but high board-depending target damage, board shaking and strong attack tiles), The Hulk (tank and annoying Black/Green synergy), Rocket and Groot (damage, strike tiles and true healing), Daredevil (good stun but very unreliable damage, so not too good).
Good luck.