It seems that the 3rd classes have been around for a while, and the RO's level cap is now 175. I wonder if Gravity will ever add 4th classes, and here are my ideas.
Rune Knight -> Dragon Knight
Royal Guard -> Royal Captain
Guillotine Cross -> Black Fang
Shadow Chaser -> Berserker
Ranger -> Falconer
Maestro -> Virtuoso
Wanderer -> Performer
Warlock -> Necromancer
Sorcerer -> Astrologer
Mechanic -> Engineer
Geneticist -> ?
Arch Bishop -> Cardinal
Sura -> ?
It will be a huge but nice to have updates, and the level cap can be bumped to 255 with 4th classes introduction. What do you think?