Tropes

Ambiguous Gender: We never see the Bat Amazon's human form.
The Immune: Mika, the Wasp Amazon, was of the few Amazons that the Anti-Amazon gas doesn't effect.
Kill the Ones You Love: It is revealed that Jin is doing this to the Amazons. He actually likes them due to the amount of work he invested to make them. But he doesn't believe it's right for humanity to be eaten to ensure their survival therefore the least he can do is kill them himself.
Sanity Slippage: Jin becomes very unhinged.
To Serve Man: Mika was one of the patrons of the Crab Amazon's restaurant.
Tragic Monster: The Wasp Amazon, who only wanted to live a peaceful life, but eventually awakened despite her efforts and had to be put down.
Your Head Asplode: Haruka punches the Bat Amazon through it's head to kill it.
Jobber: The Bat Amazon only really exists to get killed by Haruka.

Recap / Kamen Rider Amazons Ep 12 Lost In The Fog