The Cinderella of the Trinity - not many people seem to take much notice of the Holy Ghost!
Who is He, after all? There are several ideas:
1. A spirit of the undivided Trinity that proceeds from the Father. (Eastern Orthodoxy).
2. A spirit of the undivided Trinity who proceeds from the Father and the Son. (Western Catholic Christianity, and most Protestants too).
3. A separate personage from the Father and the Son (who are also separate personages); who is a spirit being (in contrast to the Father and the Son who are both embodied). (Mormon).
4. The spirit of the ascended Jesus Christ. (The author of the Fourth Gospel and Bruce Charlton).
No doubt readers will have their own opinion on this matter; but if you are undecided, I recommend re-reading the Fourth Gospel, testing its information on the Holy Ghost by your deepest intuition - and if confirmed than regarding the Holy Ghost as Jesus.
I have certainly found that the Holy Ghost has become far more important and influential - more present - in my life, since I understood Him in this fashion.
Maybe this understanding will work for you too, will come to have the clear ring of truth?