I got more succulents, they are soooo beautiful! Would be very grateful to anyone who can help identify them and clarify some issuez

1.

it has nice and chubby leaves that are apparently very yummy to caterpillar-type worms. The far right plant leaves has chomp marks on some of the leaves if you look closely. I was quite upset to find one earlier and quickly smashed it

2.

3.

These two plants are very similar. Both jellybean-ish but I'm not sure which is which. #3 is chubbier than the other with a thicker trunk and matte leaves. #2 has a thinner trunk and glossy and smaller jellies. Both of its jellies easily fall though. Is that normal?

4.

Last plant has fleshy leaves as well, though not as fleshy as the first one. Also, with the bottom leaves pointing down a bit, does that mean it's not getting enough sunlight?