Um, there is a PvP in DOMO, buuuttt i dont really know much about it so cant help u there...I love the class system
there is a variety of jobs to choose from, and you can like combine jobs to get more skills to use. Weapons and armors? You buy from the stores..there are like armor sets for beginners(lvl 10) and then more advanced ones. Same with weapons, but you can upgrade them..
and yea there are costumes in the cash shop you can buy too.
hope that helped