Dumbledore.
Although Luke would resist turning to the Gay Side, Dumbledore's twinkling eyes and penchant for sweet lemony candy would inevitably conquer the lonely single Jedi.
I think Preston would win because Luke is a wimp.
Luke Skywalker :)
Luke Skywalker.
Luke Skywalker because he is a Jedi.
Colossus
Darth Vader was Galen Marek's master, and Luke Skywlker beat Vader. So I suspect Luke would outclass Starkiller.
Darth Vader has beaten him in Empire Strikes back and it would take him 6 minutes to beat him since Luke sees how the force works. But it eventually got to the part where Vader cut his hand off. Darth Vader would win.
Hogwarts
Luke Hedley
NO!
Lets see. Obi wan trained luke Darth maul almost beat obi wan. He could of but he likes enjoying the moment. So luke was traind by obiwan so they would be pretty even. But DM would take the win.
This made him almost invulnerable. Kronus (who controlled Luke) believed that would help him win the upcoming battle.