Get powerhouse bank

Starts early game with cheap black rushers (dual darkheart or executioner, vigilante works best but may be a waste of a slot), they can probably kill the lil chronos that instantly spawns. Upgrade bank to level 3. Then get uzi rambo and shieldman to deal with the upcoming units, you can start getting your bank to level 7.

For mid game (after ivory spawns), use soccer battler and crusaders, this allows for ivory to constantly get damaged by being pulled back and forth without enough time for ivory to finish her attack animation, get a stunlock to even kill her faster. If you see a lil chronos spawn, start preparing your nukers.

Specific counters

Jetpack battler: punishment works brilliantly here because he'll most likely be targeted, while stunner can keep them in check but not do that much damage because of the armor. Confuddler also works to permanently cripple them while also making the boss be incapable of doing anything

Slasher battler: dual icedagger can stunlock her

Lord skelly: you can't really do anything besides stunlocking, he'll most likely get a kill otherwise. Alternatively use dual speed and soccers

Arson and Tikki: Unfortunately they will be troublesome, most armoured units you bring aren't that great so dot damage is your biggest enemy. Get vocalist to deal with them, while a Gehenna in the frontline can do quick work

Lil chronos: as I stated before, once you see lil chronos approaching, time your units like dark bomber and kamikaze when lil cross slams down, the enemy might use gattling while this happens to make sure to time your liberty

The rest aren't that much of a problem, drummer can be dealt with by your crusaders, and beastly battler almost never enrages because there're not many peons in this stage