In Python, we use mixins. Mixins can only inherit from 'object' and nothing else, like this:

    class PhysicsobjectMixin(object):
        def update_physics(self):
            pass
        
        def apply_konckback(self, force):
            pass

        def get_position(self):
            pass


    class FightMixin(object):
        def attack(self):
            pass

        def defend(self):
            pass

    
    class TalkMixin(object):
        def say_something(self):
            pass


    class Character(PhysicsobjectMixin, FightMixin, TalkMixin):
        pass


    class Pickup(PhysicsobjectMixin):
        pass


    class Projectile(PhysicsobjectMixin):
        pass

it's still inheritance, but the classes will be flat; every class only inherits one deep, so there will be no diamond problems and no repeating code.