hamsters are fine – my kids wife has had four (they don’t live long which teaches kids about mortality and also means YOU don’t spend years cleaning the fecker out !)
If you handle them when they’re young they don’t bite in our experience
Downside for youngish kids is that they are most entertaining after about 10pm (lost of climbing on the bars of his cage etc)
Ours have all been syrian – I assume others are similar in terms of being nocturnal/crepuscular
(make sure the wheel in the cage is big enough for them to run properly – I bought a bigger one for ours via ebay)