Ninja Cross-Class

[Felis]

Level 16 PUG is apparently not high enough to create a thread of my own, so I'm forced to ask in a ninja based post, sorry!

I'm a new player trying to build a ninja, but I've just gone over the level 16 PUG cliff on my way to my airship pass. Can I still build up as a viable Ninja or should I just make this my Monk and level up a new Ninja? Not being able to get my Rogue job without the airship pass was a surprise -_-

You don't need to create a complete character.
Once you finished the lv 10 class quest of your starting class you can unlock other classes in the other class guilds.
The Rogue class guild is hidden, but there is a sidequest at the Aetherite place in Limsa that show you where the guild is.