I've been stung by wasps several times [a wasp nest grew in the porch outside my front door and my parents refused to get rid of it for a very long time, so they regularly pestered me whenever I left or entered the house], so I'm more afraid of them than anything.
I suppose I do, the less mammalian something is the less I'm inclined to consider it 'furry', perhaps just because mammals are the staple of the fandom.
Out of curiosity are you vegetarian?
I was surprised when I found many furries represented themselves with one species- being able to change species seemed like one of the crucial aspects of the fandom- less surprised when I found out many also change their fursona periodically x3
What appeals to you about fish and wasp fursonas [do they even qualify as furry?] ?
The imagery associated with pigs is, in general, a potent mix of lardiness and muck. I actually visited an exhibiting yesterday where the main feature was a painting of an anthropomorphised pig, with great roles of fat, with the intent of saying 'people are pigs'. There's no objective reason it has to be that way, it's just our culture, isn't it?
I haven't read much fiction, but I'm guessing the wicked-thin eyes of reptiles, along with the predatory connotations and flattened, sharp snout matches your stereotypical bad guy. I think some reptile species would make suitable good guys though, geicos, salamanders and a variety of dinosaur species could pull it off well.