I've copied something that dauer posted on another thread related to the return of the Moshiach .... I don't believe he is considered a King, but his return will herald a new era of peace ....
"Here are some of the primary activities of the Jewish Moshiach:
The Moshiach will be a man of this world, an observant Jew with fear of G-d. (Isaiah 11:2)
Evil and tyranny will not be able to stand before his leadership. (Isaiah 11:4)
He will be descended from David HaMelech (Isaiah 11:1) via Solomon (1 Chron. 22:8-10)
Once he is King, leaders of other nations will look to him for guidance. (Isaiah 2:4).
He will be a messenger of peace. (Isaiah 52:7)
There will be no more hunger or illness, and death will cease (Isaiah 25:8).
Weapons of war will be destroyed (Ezekiel 39:9)
Knowledge of G-d will fill the world (Isaiah 11:9).
The peoples of the world will turn to the Jews for spiritual guidance (Zechariah 8:23).
All of the dead will rise again (Isaiah 26:19).
Jews will have returned to their homeland (Isaiah 11:12)
The Jewish people will experience eternal joy and gladness (Isaiah 51:11).
The Sanhedrin will be re-established. (Isaiah 1:26)
The ruined cities of Israel will be restored (Ezekiel 16:55).
The Temple will be rebuilt (Ezekiel 40) resuming many of the suspended mitzvos.
The whole world will worship the One G-d of Israel. (Isaiah 2:17)
http://www.kosherjudaism.com/moshiach.pdf " (previously posted by dauer)
Hope this helps. Aloha nui, poh