Important note: we live in the tropics with no garden of our own
I was thinking of a couple of mice. Maybe not a hamster because of the nocturnal thing. What are gerbils like? Guinea pigs I think would take up too much space as they would need to be indoors. I doubt I could buy a rat here, it would probably not be considered acceptable as a pet. I don't like snakes
I suppose turtles is another option (not super furry I know...).
All I know can be summed up as: mice = can be smelly; hamsters = need handling to be friendly, nocturnal; gerbils ? ; guinea pigs = nice but need a big cage, yes?