1) Are there other words that are mabnī in the Arabic language?
Yes, there are many words that are mabnī, meaning that they do not change based on the case. In English, this is the default whereas case endings are the exception. In Arabic, it is more balanced and there is almost an even distribution between the types of words that are mabnī and those that are not.
2) Are pointing nouns definite or indefinite?
They are always definite.