Hamster - Captain Hamatron
Fish - Agnes and Charles (his full name is Professor Charles Xavier X-man)
Rats - the albino is Blanquita ('little white thing') and the hooded is Besitos ('little kisses' - he grooms me a lot!)
I had no part in the naming, my 8yo son picked them....
guinea pigs- Fudge and Darwin. Fudge because I thought it was a guinea pig name, and my brother named the other one Darwin because he'd just seen the film G-Force, about guineas who are spies, and the leader was called Darwin.
dwarf hamsters- my mum named them Tim, Tom and Tony. I don't know why.
The theme for the boys was something dark-sounding.
For the girls, we wanted names that had the same first letter again but we couldn't decide on something we all liked. So instead they've rhyming names.