General notes are you’ll want to avoid the stun hitting Maneater or Helicath on the first stun.  Place them last in the turn order and ensure you have someone of weak and/or neutral affinity ahead of them with at least one being green affinity (to avoid Hellcat taking the stun).

NINJA Specific Notes

Ninja’s skills must be prioritized in order a3, a2, a1.  Open with his a2 on all difficulties.  This means his order will be a2, a3, a2, a1, a1
Ninja will not work for Force (red) affinity – substitute a champion at 214 speed (like normal CatEater).
On Brutal difficulty he cannot take the stun.  He should have veil up though, so it should be fine.
Cannot take the counter attack masteries in the defensive tree (best to simply go support tree).  Will not work with counter attack.
Ally Attacks must be timed to happen right before the stun on all difficulties.  Make sure to time those skills.

UNM Setup
Seeker works on a 3 turn delay (a1, a1, a1, a2) or a 5 turn delay if he gets stunned (a1, a1, a1, stunned, a1, a2)
Helicath (or Tower, Warcaster, Sir Nicholas) needs to time the a3 block damage skill to block the first aoe and a 3 turn delay works (a1, a2, a1, a3)
Maneater opens with his a1, then a3
Ninja’s skills must be prioritized in order a3, a2, a1.  Open with his a2

After those delays are done it’s full auto by the end of turn 2 (turn 3 if Seeker get’s stunned) syncing by turn 7

Nightmare Setup
Seeker works on a 5 turn delay (a1, a1, a1, a1, a1, a2) or a 5 turn delay
Helicath (or Tower, Warcaster, Sir Nicholas) needs to time the a3 block damage skill to block the first aoe and a 3 turn delay works (a1, a2, a1, a3)
Maneater opens with his a1, the a3
Ninja’s skills must be prioritized in order a3, a2, a1.  Open with his a2

After those delays are done it’s full auto Syncing by turn 7

Brutal Setup
You will need to actively avoid Seeker taking the stun, anyone else is a valid target.
Seeker works on a 4 turn delay (a1, a1, a1, a1, a2)
Helicath (or Tower, Warcaster, Sir Nicholas) needs open with their a3 skill
Maneater has a 2 turn delay on the a3 (a1, a1, a3)
Ninja’s skills must be prioritized in order a3, a2, a1.  Open with his a2.  HE CANNOT TAKE THE STUN.

After those delays are done it’s full auto and syncs on turn 3