I suspect databases may need to have the unicode inited during creation but i am not sure if that is possible. For questions like this it would be helpful for you to reach out through the service providers support channels.
https://docs.run.pivotal.io/marketplace/contacting-service-providers-for-support.html
As far as accessing the database you will need to first create a service key and then connect to the database using the credentials provided by the service key.
https://docs.run.pivotal.io/devguide/services/service-keys.html