Is what was mentioned concerning the form of the Holy Quran, as a handsome person who defends the deceased in his grave and admits him into Paradise, correct?

A very weak hadith has been reported regarding Surat Al-Mulk coming to its companion in the grave, but it is established that righteous deeds and the Quran intercede for their doer. Muslims should teach the Quran and Sunnah and act upon them, and propagate what is established from the texts of revelation, not unsubstantiated articles. This is an application of the hadith, "Convey from me, even if it is a single verse."