The Holy Spirit is God. He is the feminine element of the trinity. The pronoun should be it or she, but since we think of God as this big alpha male, we clump the Holy Spirit as a part of the He. His presence is just as impactful and important as God the father and God the son. He is always there. His ministry is in the believer's life.
The Holy Spirit is another helper. He is smart. He knows and understands reality. He has his own mind, but he is aligned with God in perfect unison. He is a researcher. He looks into depth into everything including God's ways. He knows everyone's thoughts and understands where each person is coming from.
The Holy Spirit has emotions. We are ordered not to grieve the Holy Spirit. He has volition where he can determine situations and feelings. He is decisive. He is the one that decides what Christians get as a spiritual gift. He sets people apart for certain things. He understands our value and gives us things that will help us serve God and each other.
The Holy Spirit's attributes are omniscient, omnipresent, eternal, truthful, caring, witness, and integrity. He is deity. Wherever he is Lord, there is freedom. If you try to lie to Him, then He will know. It is the same as if you were lying to a person, but you will never get away with it.
Psalm 139:7-12, Isaiah 40:12-14, John 14:12-21, Acts 5:3-4, 13:1-3, Romans 8:26-30, 1 Corinthians 2-10-12, 12:7-11, 2 Corinthians 3:16-18, Ephesians 4:30, 2 Timothy 1:5-7, Hebrew 9:13-15, & 1 John 5:6-10