An obvious one would be KID as a dove... but also, a pigeon. The only real difference between a dove and a pigeon is linguistic, while many associate dove as a gentle white bird that symbolizes peace, many think of pigeons as pests that shit all over the place. Just the same kind of bird but different names come with different associations, like KID the gentleman thief and Kuroba Kaito the regular highschooler who loves to make pranks.

As for Shinichi I associate him with a raven. For one, it's their association with omens and bad things happening, which Shinichi himself is prone to as a crime-magnet. And Ravens are able to mimic sounds of other birds, which is something Shinichi does (even if it's with help of an equipment). Also probably the association with Edgar Allan Poe.

I'm really just going off of what I gathered about these birds on the internet and I'm not at all an expert in any of them (just a disclaimer in case someone is and they see this and they think I'm saying something wrong lol) but I closely associate them with birds... but also cats. Though my explanations for cats is more surface level, such as how they act at times or how they are treated by other characters.