Every plump goodboi buggerino Scarabaeidae. For a number of reasons, all of which stem from my childhood. Gerald Durrell was one of my favourite writers back then ,and he has an entire short story dedicated to flower chafers of Corfu. And also I visited various natural science museums with my family a few times, and all the rhinoceros beetles in those glass wall showcases, and especially little display boxes with a space just for one beetle and with intricate wooden frames almost like art painting frames - those enchanted the internal collector in me. I mean, butterflies are beautiful and all, but I always found them to be either too plain looking or overly lush, unlike beetles who always struck me as having a proper aesthetical balance. Also, there is (or may be was) a somewhat customary practice for Russian children, where every May they would make scoop-nets and hunt Melolontha beetles who breed at this time and fly in droves in warm May evenings to eat birch leaves; and their hunters would put the beetles they catch into match-stick boxes and feed them the leaves and then set them free the next day, and this whole species is called "May beetle" in Russian.
Dytiscidae are also cool.
>Dragonfly
Their larvae have literal alien-tier mouths:
https://cdn.kqed.org/wp-content/uploads/sites/35/2017/09/DL_416DragonflyNymphs_DARNER_NYMPH_CATCHES_FLY_WITH_LABIUM_500.gif