What do you look out for when main-ing a character/class/job?

Being able to stay alive if you fall asleep training at SH.

Uniqueness, weapon/skill themes. I make characters with an overall look, theme, and color-scheme in mind. I was so determined to main my Hero xSarina because I fell in love with her theme + Hero Class but then my Paladin came along and changed that. :>

I very much dislike classes that already have an established theme that is over encompassing. Demon Slayer, Kaiser, Angelic Buster, and some of the Maple Heroes are good examples. There's not much fun in making "new" characters otherwise.