Questions for the experts

Hi all decided to grow my first lot of peppers / chilli’s this year. I’m in Australia so as summer started I started germinating my seeds, around September.

I purchased: Jalapeño, Habenero, Hungarian Blacks, Aji Lemons.

However, I recently acquired these 2 mystery plants that i have saved from near death and are now fruiting.

Few questions:

1. Are my plants tracking okay, or have they been too slow?

2. What are these mystery chilli plants?

3. When do I harvest? Most jalapeño chilli’s i have eaten before are green, i picked one and it was very mild. The Aji Lemons have been green for about 2 weeks…

4. What’s is the black/brown markings on my aji lemons??

5. What’s happening to one of my Hungarian Black plants? It’s had the exact same conditions as the other but looks like it’s suffering

Thanks everyone