Board Thread:Game Discussion/@comment-213.249.208.178-20130912141153/@comment-10727129-20130917102948

The weapons don't have to be specific to that character, but it does generally work out better because of all the stat bonuses... Unless the weapon really sucks.

Don't know if it was mentioned... You will get a lot more medals for upgrading during boss events. On top of that, during boss events, upgrading receives a 100% bonus and selling doubles your money. So boss events are the best time for that if you can wait. Definitely for weapons, which are a complete pain to upgrade past 8 or 9.