This is not a translation of a post, but rather a collection of information that I gathered by reading bunch of posts at their forum.
It seems that Aion's concept of "titles" differ from traditional use of titles in L2 and L1. They are not simply lines above names that you can write whatevers on.
So what is a title? In Aion, title is an "equippable" item
acquired through quests/missions that gives you stats.
In the screenshot above, the character is currrently equipping a "Tolbaz's Problem Solver" title. So it says Tolbaz's Problem Solver 한낫 (the char's name) on the character.
It also says it on the window that Tolbaz's Problem Solver title gives following stats:
Strength: -5
Speed: +2
This character also has 3 other titles, including Poata's Guardian, Elm's Friend, and Scarecrow's Friend.