Jesus
So this is a tricky one: most modern historians believe that Jesus actually historically existed, however many agree that it is uncertain that his portrayals in the Bible are actually accurate or historically reliable. Regardless, he is undeniably a centrally important figure in Christianity.
King Solomon
Similar to Jesus, scholars generally agree that Solomon most likely himself existed, however scholars across the spectrum of biblical archeology agree that it is very difficult to construct a historically accurate portrayal of the king.