This appears to be some kind of larval insect on tree of heaven.
Found several more fat juicy ones on the same milkweed stem where I saw one the other day.
Two Broad-banded Hornet Flies perched on my still-blooming Bottlebrush Buckeye (see 4th photo showing both).
Small orange larvae eating the aphids, I'm assuming they're hover flies?
One large and one really small larva