So, in my sci-fantasy story stuff, there's a large group of people who call themselves "chimeras". They mostly used to be humans who built themselves new cooler furry critter bodies.
There's an intelligent research AI who was created for the project. They're kind of an important character and later get involved in lots of other hijinks.
(to be continued...)
@VoxSomniator I wouldn't say two references to greek is too much, so Echidna seems fun to me.
You could also give them a second name. The AI could've been codenamed Echidna and then they choose a new name for themselves. Supposing this AI has personhood rather than being pure function.