To me, the first should be ants, they’re practically everywhere and there’s a lot of them
Honestly, I’m going to go with spiders. I love spiders, and the fact that I can have an army of Hobos, Fiddlebacks (Brown Recluse), Redbacks, Mouse, and Funnelwebs, that people are already naturally are terrified of but also regularly prey on other insects? Yes please! Plus, it would mean all the jumpers would be my buddies! Precious little fluffy babies<3
A close second is wasps, but that’s only because wasps species make up 1/3 of all insect species out there.
Mosquitoes. If they were organised and had a goal, they could destroy humans. Imagine if they all line up to suck from someone with loads of diseases to get some viral load and then go and seek out people in positions of power to infect.
In the UK we call them daddy long legs, I don’t know what they would be called in the US - though I think it might be horseflies(?). Anyway I was told at School that IF they could break human skin, they would be deadly to us - but they haven’t evolved that ability - yet. So I think they would be who I would befriend first - just in case.
Edit: crane flies
The idea that daddy longlegs are highly venomous and just unable to pierce human skin is an urban myth and has no basis in reality. https://www.snopes.com/fact-check/daddy-longlegs/