Paarthurnax was originally a lieutenant to his eldest brother as were all dragons, for Alduin was the first among them and dragon values place a great deal of import on linage since they are the children of the god Akatosh. He is old yet wise at this, He has given advice to many during his 6500-7000 years at life. He’s incredibly clingy at times as he just wishes for conversation but doesn’t do so because he must meditate on the words of power.