Ringtail possums pose absolutely no danger to people.Their biggest danger is to other pets, not because they have sharp teeth and claws (as a possum will inevitably come off worse in a confrontation...
Possums do not deliberately attack people. If cornered, they may launch out with their teeth and claws in self-defence, but they do prefer to avoid any confrontation.
No. Possums eat vegetation, fruit, nectar and some varieties of possums eat insects. They cannot eat people, and will only ever bite in self-defence. N.B. True possums, which are found in Australia...