As for real historical figure of Jesus's existence...nil.
As one would expect for any itinerant preacher in 1st century Judea. If there were actual "evidence" that'd be far more suspicious than the lack. In an era with no birth certificates, baptismal records, death certificates, marriage licenses, tax returns, etc. why would we have any evidence for anyone's existence except top political, cultural, and military figures, and not even all of them? As late as the 14th century no name was attached to
Sir Gawain and the Green Knight, should we just assume that it popped into existence magically and the anonymous author is fictional because we have no proof of his/her existence?