Many non-trinitarians believe that it's an agent of God - Muslims
teach that it's an angel - or it may be impersonal aspect of God - this is the traditional Jewish
understanding, if I've read them correctly. The word in Hebrew means breath or wind more than
it does "ghost," like an invisible person. It is something poured (Isaiah 44:3, Joel 2:28)
and you usually don't pour people.
Spirits are not people, they are persons.
And spirits can be poured, like oil and water, their symbols, can be poured.
Also, when we write about the Holy Spirit, we usually write "it" rather than "he."
Then you are writing incorrectly, because Jesus said "he" six times in Jn 16:13-14.
An "it"
doesn't have
intelligence - Lk 12:12; Jn 14:26, 15:26, 16:13; Ro 8:27; 1Co 2:12-13; 1Jn 2:20, 27;
doesn't have
a will - Ac 16:6-7; 1Co 12:11,
doesn't have
affections - Eph 4:30;
is not
sinned against - Ac 5:3; Mt 12:31-32;
doesn't
speak - Ac 8:29, 10:19-20, 11:12, 13:2, 21:11; Rev 2:7;
doesn't
decide - Ac 15:28;
doesn't
forbid - Ac 16:7;
doesn't
testify - Ac 5:32; Jn 15:26; Ro 8:16; Heb 2:4;
doesn't
search into secrets - 1Co 2:10
doesn't
show the future - Jn 16:13b; 1Tim 4:1; 1Pe 1:11, 2Pe 1:21;
doesn't
appoint and send out missionaries - Ac 13:4, 20:28;
doesn't
intercede - Ro 8:26-27;
doesn't
enable - Ac 2:4; Ro 8:26;
doesn't
counsel, teach, guide, convict, comfort - Jn 14:16, 26, 15:26, 16:7;
doesn't
lead - Gal 5:18;
doesn't
generate Christ's body and soul - Mt 1:18.
The Holy Spirit is
everywhere personified throughout the NT
because the Holy Spirit is a "he," not an "it," who
can be poured.
That is the testimony of the NT word of God,
and it is not for us to say that a spirit cannot be poured.
We don't do that in English with people. With this kind of language, I can understand why people think it's impersonal. Why not call the Holy Spirit a "he," like the other two parts of the Trinity? I don't know anybody, personally, who does that.
Perhaps you should review your Bible, beginning with Jesus, his apostles and other NT writers.