Mosquitos and Cicada Song[]
The mosquito in Chapter 4 uses a Cicada Song that is near-impossible to prevent. Mosquitos sometimes carry Cicada Song cards, especially in Hard Mode.
the Subordinates[]
The three subordinates have two Neptune Horn cards and two Bagworm Shell cards in chapter 5, and then one of each in chapter 6.
the Four Generals[]
The Four Generals almost always have two Dragonfly Rage cards, and two Bagworm Shell cards.
Shoya[]
In some chapters, Shoya has 3 (may as well be infinite) Beetle Horn cards, which can be very deadly, even with extremely high defense.
Badlands 20+[]
Butterfly: ? Cricket Song cards.
Rhino Beetle: 2 Neptune Horn cards.
Stag Beetle: 1 Neptune Horn card.
Mantis: 1 Neptune Horn card.
Dragonfly: ? Dragonfly Rage cards.
Ladybug: 2 Mantis Touch cards.
Snail: 2 Morpho Dance cards.
Pillbug: 2 Bagworm Shell cards.
Locust: no cards.
Spider: ? Monarch Dance cards. [do all units have these? or is it specific to a few units?]