Obviously all theoretical. Unless…
The following assumes that they’re tiny humanoids with wings and no magic spells/powers.
What would you say the size range is for our tiny winged beings? I often imagine incredibly small, like AA battery size. Then my brain makes like a runaway train, thinking about things like logistics and plausibility (I know they’re fictional magic beings but that’s the runaway train part).
Once I get into that mode, I start imagining them bigger, to an extent. As big as a futbol, usually. All the various children’s stories have them anywhere from palm-sized to as small as bugs.
I guess for imagery sake, imagine you had a roommate that was one, so you have to take their size into account for things like cooking and cleaning. What chores would be exclusive to each person based on size? Would they be able to lift/carry human-size objects?
I imagine a pixie to be roughly half the weight of two pixies, and double the height of a child pixie.
Or like 6-10 cm. They could train and ride rats into battle. And they absolutely would.
Fairies? Lower range of human size. Like your aunt who is super short but not like a medical condition. Fairies have a lot of medical conditions, though. Researchers speculate it is caused by inbreeding, but the fairies refuse.