AusBonsai

Just watering my Bonsai when found these in the pots… yuck. Do I need to get rid and how do I do so? Do I need repot?

Let them be not dangerous for trees

Photos are not great quality but those look like millipedes meaning lots of legs.
Australia has lots of different species. We also have one introduced species - Portugese millipede that occasionally builds up to plague numbers and invades houses.
Millipedes feed on leaf litter and moss so should not cause any harm to your bonsai.