أَنَاْ

A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – أَنَاْ is a noun

A noun may either be 1) Definite or indefinite 2) Masculine or feminine 3) Singular, dual or plural 4) Nominative, accusative, genitive or fixed 

أَنَاْ is a first person, singular, personal pronoun meaning I, Myself and refers to masculine and feminine

Surah/Below are the 8 verses in the holy Quran containing the first person, singular, detached pronounأَنَا
Verse
Except whom repent and be righteous and openly declareإِلَّا الَّذِيْنَ تَابُوْا وَأَصْلَحُوْا وَبَيَّنُوْا
2-160then those I will accept repentance from them I am the One Who accepts repentance, the Most Mercifulفَأُوْلَآئِكَ أَتُوْبُ عَلَيْهِمْ وَأَنَا التَّوَّابُ الرَّحِيْمُ
15-49
15-89
20-13
20-14
27-9
28-30
109-4And I will not worship what you worshippedوَلَآ أَنَاْ عَابِدٌ مَّا عَبَدْتُمْ