Allah said,

كِرَامٍ بَرَرَةٍ ﴿١٦﴾

Honorable and obedient.

meaning, they are noble, handsome, and honorable in their creation. Their character and their deeds are righteous, pure and perfect.

Here it should be noted that it is necessary for one who carries the Qur'an (i.e., the angel) to be following righteousness and guidance.

Imam Ahmad recorded from Aishah that the Messenger of Allah said,

الَّذِي يَقْرَأُ الْقُرْآنَ وَهُوَ مَاهِرٌ بِهِ، مَعَ السَّفَرَةِ الْكِرَامِ الْبَرَرَةِ، وَالَّذِي يَقْرَؤُهُ وَهُوَ عَلَيْهِ شَاقٌّ، لَهُ أَجْرَان

He who recites the Qur'an proficiently, will be with the noble, righteous, ambassador angels, and the one who recites it with difficulty will receive two rewards.

This Hadith was reported by the group.