Front rank: Warduke. Chaotic Evil
Insanely overpowered character. Deals massive damage and one of the best tanks in the game for soaking damage, and every hit he takes applies a multiplier to his damage (as well as every attack he makes). AND HE CLEAVES UNLIMITED TARGETS WITH NO DAMAGE DROPOFF. "Drawn to Power" applies a multiplier to his damage for every positional ability affecting him, stacking multiplicatively (which is insane). Usually I can get this number to 9, 10, sometimes 11 effects - typically topping the bonus off somewhere between 1e07 and 1e08 damage multiplier. "Chaos Reigns" applies a bonus, stacked multiplicatively, for every chaotic-aligned champion in the formation, of which I have 5. The bonus for evil characters (if I'd chosen evil alignment instead of chaotic) is 5 times higher per character, but I only have 2 evil characters to run that fit the meta, and 100^5 is more than 500^2. By a lot. And what makes it all work out is his Chaotic Inversion ability that inverts the area of every positional effect in the party.
Second rank top position: Orkira - Chaotic Good
Burning hands deals huge damage in a medium AOE cone and applies a debuff that makes the targets affected take more damage, stacking up to 10 times. When the baddies start stacking up in front of the Warduke... whuf. Lesser Restoration is pretty decent healing, often a bit tricky to use because it normally only affects characters NOT adjacent to Orkira... but Warduke inverts this. Putting Orkira right behind Warduke means now Warduke has a reliable healer, and it counts as a positional affect.
Second rank bottom position: Makos - Neutral Evil
Helps with decent damage in the early to mid game while Warduke is getting spooled up, and his inverted (same deal as Orkira) Dark Blessing dramatically increases damage of Warduke... and counts as a positional affect, increasing the damage of Warduke.
Middle rank top position: Tyril - Neutral Good
Moonbeam increases damage of all champions, but gotta keep Tyril on the edge of the formation for it to work well. Also his Druidic Healing is inverted to heal people NOT adjacent to him (IE, Warduke) and counts as a positional affect, say it with me now, increasing the damage of Warduke. The healing itself isn't great, but the damage boost is.
Middle rank middle position: Penelope - Chaotic Good
Debuffs any enemy she hits to take WAY more damage if you have a lot of Good-aligned characters in the party, which I do. When anyone in the party comes under attack, she does positional healing healing (heals and buffs Warduke) and damage buffing for every champion depending on how many are around her, hence putting her right in the middle for best effect. Also she gets a really powerful knockback that trivializes boss waves.
Middle rank bottom position: Evelyn - Neutral Good
Divine Prayer increases damage of all champions
HA HA WARDUKE SAYS IN FRONT of Evelyn. Which is also a positional affect, which further boosts Warduke's damage.
Fourth rank top position: Stoki - Lawful Neutral
In addition to positional effects that end up buffing Warduke's damage more, she also can get enough marks of ki put on the enemy stack in front of warduke that using Ki Explosion starts doing massive damage (pictured in previous post).
Fourth rank bottom position: Calliope - Chaotic good
Positional effects that (inverted) that, once again, double dip on boosting Warduke's damage. Also the temporary HP shield from Song of Protection comes in handy.
Last rank: Widdle - Chaotic Neutral
It was hard to give up Celeste, as that reliable healing is quite a crutch that is easy to get used to, but Widdle makes it worth it - her (inverted) vampiric gaze increases the damage of those (not - Warduke) adjacent to her, which again, double dips on multiplying Warduke's damage. Additionally, "Hurry Up Now" means anyone affected by vampiric gaze (Warduke) has a 25% chance to immediately reset their attack cooldown after attacking (lots of free attacks for Warduke).
So, as things stand, Warduke is doing an INSANE amount of damage -
... and whenever he comes under attack he gets healed for 1.69e04 HP per round (double that, if he isn't full HP, thanks to Orkira), and he has 3.51e05 max HP, and Calliope usually refreshes a 1e05 damage buffer on him before it even has a chance to run out. I've got his feats set up so that it takes 30 enemies attacking him simultaneously to overwhelm him, and even then, he can still tank amazingly.
And remember, the BUD (Base Ultimate Damage) which determines the damage of your ultimates is based on the highest single target hit damage done recently. So even though nobody else is holding a candle to Warduke for ordinary damage... their ultimates benefit from his overpoweredness. Hence me stacking all my familiars on the ultimate buttons in the late game.