I could do without house sparrows. Someone thought they were a good idea, and brought them to America where they are now one of very few birds you can kill as a pest. They’re aggressive, noisy, numerous.
African bees should never have gotten here either. :(
The latest lizards I see around seem to have killed off the geckos and the lizards that I grew up seeing before the geckos came into the area.
There are invasive ant species (crazy raspberry ants, or some such name), invasive fish and barnacle species, and invasive plants.
Some invaders are plain pests and the Guardian lefty seems to be of the mind that if white people don’t like something it must be commendable.
Don’t forget starlings either, a far more noxious bird...