some of my comments

And if in order...
- Griffins are weak, but they attack everyone in response, so if you have a lot of them, it will be very painful for the enemies :)

And they also fly and quite far.

- Unicorns - blinding is the key, and it works again and again :)

However, throwing them into the forefront against machines or undead is pointless. (a minus for blinding)

- Crusaders - strong infantry with protection against Death.

They just move slowly and sluggishly

- Monks - powerful archers with protection against Death.

This is true, there is nothing to add or subtract.

- Djinns - excellent spellcasters, but their stats are weak :(

If you attack from a distance, the lack of health and armor is not very noticeable. Plus, they can fly.

- Nagas - a powerful melee unit with retaliation.

They move little. They are easily defeated by spellcasters and archers of level 3. Not an ideal option

- Vampires - an excellent unit, with retaliation, they regenerate, and you can also raise them with necromancy :)

As I already wrote, this is the strongest 3rd-level enemy in the game (according to the scriptwriters' idea)

- Poisonous creatures - a good archer with poisoning.

That's all. Nothing more to add.

- Ifrits - not bad units with an excellent fire shield :)

Again, they can fly. Immune to fire. Good

- Nightmares - cute horses that can also terrorize :)

They scare, not terrorize. Things are not so simple with them: you can't scare everyone. They are stronger than Ifrits in their element, but at the same time, they usually suffer large losses in battle.

- Ogre mages - cheap and very effective :)

Perhaps the worst enemy. Besides Bloodlust, they don't know anything useful. They don't move far. They are easily defeated.

- Cyclops - an excellent archer, but can hit their own :(

Don't throw them at your own. The advantage of a Cyclops is to defeat an army consisting of small units, or magically immune monsters.

And you also didn't describe the Flowers and the Sorceress.