The number one spot belongs to Cyclops. Mr. Scott Summers has guided his race from the brink of extinction and has continuously gotten them out of their toughest spots with his incredible strategic prowess and willingness to make the tough calls when no one else could have. He has always been the X-Men's golden boy and continues to prove it even after decades of being on the team.
2. Emma Frost
The current leading X lady comes in at number two. Emma IMO has done more for Scott's development as a character than Jean ever did. Emma is b*tchy and intelligent and can kick your ass with some class. If someone asked me who my favorite character was I couldn't say just one. I would say Emma and Scott as a unit take it. I feel both when written properly bring out the best in each other and have a great character dynamic.
Wolverine is my original favorite X. His unbreakable skeleton and tough, yet caring attitude combined with his powerful healing factor, claws, and premiere martial arts prowess make him one of Marvel's deadliest creations.
The Ragin' Cajun comes in at number 4. Gambit's smooth charm and cool attitude and mixed with his explosive powers and cunning wit will always put him in my top 5.
The purple ninja who's badass with dat ass comes in at number 5. Betsy is just too awesome not to have as a top 10. She can beat you up with a simple thought in her head or go the cool route and slice and dice with a sweet katana or some good ole hand to hand combat.
This farm boy comes in at number 6. Piotr Rasputin is one of the X-Men's powerhouses and his firm on the battlefield style belies his gentle giant attitude. With his juggernaut powers adding a new twist to his character it makes him a tortured artist.
Crazy powerful demon chick coming in at 7.
8. Professor X
The man who started this all. The often described "strongest telepath on the planet" makes his way in at number 8. Good ole Chuck is too legendary in the X-Men mythos to pass up and with his kind attitude and fatherly instincts to the X-Men when they needed it he wills always be a favorite of mine.
Magneto comes in at 9. Once a villain but turned hero gives him a spot on my list.
Bobby Drake is number 10. He fills my last spot and he is just too cool not to have here. Pun intended.