My yellow invasion team is usually something like Jack[Ba], Finnick[Ju], Moana[Mi], Nick[Ju], Miguel[Je].
Jack has great sustainability vs. the bots thanks to healing from his disk, and can protect the rest of your team provided you keep using his active skill. He doesn’t do a lot of damage to the bot, though - but does a lot in Breaker quests.
Finnick. Weehee. +++damage to slowed enemies. What boost do we get the most of in invasion? Slow. Use it and see things die.
Moana’s disk allows her to shield and buff the ‘weakest’ ally - who that is might change, it’s often Miguel, but could end up being any of them. It’s great.
Nick has the LEMMING POWAH and combined with Finnick’s buff will shred most breaker quests, and do a good chunk to the mama bots. Don’t let him die though, or you’ll need to charge him back up to 5 lemmings. His disk gives a handy shield to Jack to help him survive the initial hit from the mama bot at higher levels.
Miguel is the best healer in the game & provides handy support too. Play on manual and don’t use his skill for maximum healing! His disk boosts what he’s already great at, which is healing, it gives more healing, all the healing, every healing, heal moreeee
Other useful yellow heroes include:
Judy[Fe] - gives a nice extra boost each time you knock out a creep vs. the bot. I find Moana[Mi] to do a similar job better (and deal more damage), but Judy certainly has merit.
Barbossa[ED] - As one of the best single-target damagers in the game, Barbossa can do a lot of damage to the mama bot - if he can hit her. He targets the front line, so when she chucks out creeps he’s rendered ineffective. He can also slow and provide study, both useful things to have.
Bogo[Mr] - Because Jack doesn’t do a lot of damage to the mama bot, another option for even better sustain is to use Bogo. He’ll soak up the bots death rays for the entire battle, not allowing her to get into your back line. I prefer Jack for his usefulness in Breaker quests when there’s a strong anti-Nick ward in play.
I don’t recommend:
Sulley - don’t be tempted by him. Miguel offers better healing, and scare in invasion isn’t that useful since heroes’ crit ratings get bumped anyway.
Tia - no need.
Maleficent - too squishy to take any sort of hit in breaker quests, and we already have a ton of fantastic damage with Nick.
Yax - If you don’t have Miguel (or Sulley, for that matter), use Yax. Otherwise, don’t.
Don’t know / don’t have: