Here are a few lists I just came up with, the "Pixel" is really optional.
1. Pixel Peasant
2. Pixel Serf
3. Pixel Neophyte
4. Pixel Journeyman
5. Pixel Master
6. Pixel Guru
7. Pixel Sage
8. Pixel Ascendant
9. Pixel Demigod
10. Pixel God
1. Pixel Peasant
2. Pixel Squire
3. Pixel Footman
4. Pixel Horseman
5. Pixel Knight
6. Pixel Paladin
7. Pixel Champion
8. Pixel Hero
9. Pixel Legend
10. Pixel Paradigm
1. Pixel Landlubber
2. Pixel Swabber
3. Pixel Cabin Boy
4. Pixel Crewman
5. Pixel Sea Dog
6. Pixel Buccaneer
7. Pixel Swashbuckler
8. Pixel Corsair
9. Pixel Captain
10. Pixel Admiral of the Black (This one could be just Admiral, though Admiral of the Black is cooler sounding, and it means something!)