Is belief in the divinity and personhood of the Holy Spirit limited only to trinitarians?

For context: yesterday I asked two questions regarding what I would call "non-standard binitarianism" Father & Spirit no Son and Son & Spirit no Father the answer to both of these questions was that no such theological structure exists or by evidence seems to have ever existed. Given that there seems to be no theological underpinning for a belief system that includes the Spirit to the exclusion of the Son my question now becomes: Is Trinitarianism the only theological model that includes the divine entity of the Holy Spirit?