i am building a dex fighter, right now i have 84dex , but not sure wut chars to use, i see many different types.

Most likely a dex charm so you can reach 100 - 120 dex. Unless you put your stat points into dex, if then go for a strength/dex charm. If you have a crazy weapon with a good amount of ee, then try for a stat/life steal charm so you can do a little more chains