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I've read the suggestions and decided to offer my own – what if we created a purely aquatic city? More precisely, a city with aquatic units.
Level 1: Margol – a fish-like creature armed with a spear.
Upgrade: Margol Hunter – armed with a bow.
Alternate Upgrade: Venomous Margol – feeds on poisonous sea creatures and releases the remaining poison through spines on its body. Unlike the wyvern's poison from the Orcish castle, it doesn't deal much damage, but with each turn, the initiative and speed of the poisoned warrior decrease.
Level 2: Triton – armed with a trident.
Upgrade: Margol Master – can summon Margols (like demons opening a gate). In this case, a small number of Margols arrive each turn and disappear after the battle.
Alternate Upgrade: Triton Hunter – possesses a net that slows down one enemy. Throwing the net is an individual skill.
Level 3: Undine (mermaid) – can cast some spells (I haven't figured out which ones yet).
Upgrade: Magic Mermaid – casts more spells, has more mana.
Alternate Upgrade: Siren – a ranged unit that deals weak damage but to ALL enemy units.
Level 4: Pirate – appearance: a standard pirate, but with all limbs intact, wielding a cutlass in each hand. Ability: after battle, can seize a portion of the enemy's resources.
Upgrade: Sea Wolf – the presence of at least one Sea Wolf on a ship increases movement speed on the sea by 25%. In addition, no one dies in whirlpools.
Alternate Upgrade (let's call it Pirate Captain) – ability: boarding – the only unit that, with a rope, can climb over castle walls.
Level 5: Ichthyander – a large knife, ability: evasion of ranged attacks – let's say, 75% chance to dodge, moving to an adjacent cell.
Upgrade: Son of the Sea – calls for help from water elementals (depending on the number).
Alternate Upgrade: Sea Devil – 90% evasion of ranged attacks. In addition, being constantly wet, it cannot be captured by dendroids' roots, etc.
Level 6: Sea Monster – a large creature that captures enemy units and digests them.
Upgrade: Abominable Monster – ability: belch – an undigested number of units are thrown at the enemy, dealing damage to the units.
Alternate Upgrade: Hungry Monster – heals health and restores the number of units by digesting.
Level 7: KRAKEN – powerful, with a lot of health and damage. An army with a Kraken has the ability to sink ships.
Upgrade: Battle Kraken – deals damage to 2-3 cells forward with its tentacles, plus attacks multiple enemies.
Alternate Upgrade: Kraken Phantom – receives 25% less damage. The ability to kill large monsters on it does not work.
Neutral unit: Sea Elemental – slightly different magic, a bit more health, less susceptible to fire magic (sea water is harder to heat).
I haven't come up with a skill for heroes yet. What do you think of my idea?
And last but not least: HAPPY NEW YEAR! May you have successful battles, endless mana, and only the weeks you need!


