I keep hearing something about advanced classes being able to turn into monsters, is this true?

For the Cat,yesh.

When you choose advanced job your character model/gfx changes. Disguise system allows you to look like a lion again after you advanced to gunner and if you don't like the gunner sprites or are too attached to the looks of your lion.

they are both right, 1 char I think its cat has the ability to disguise himself as a monster. There was a 2nd job class guide on these forums somewhere that shows the abilities disguise was 1 of them for I think cat, I would search and find out if that interests you.

Also everyone can pay money to disguise there character to look like pre secondary job class change, thats an option not a requirment the only thing that changes is you look like a first job char but you still are a second job char.

Nuuuuuu....

Anyone have anymore infomation on the cat's skill? Do you chose what monster you want to disguise as? I really want to know, this might make me want to chose the cat. lol