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Attact charactor go with offense pick 2 and deffense pick 1 each rank some attact charactor need to go with support but rare it defends what kind of buffs have.

Deffense and support charactors are go with Deffense and Support mostly but also it defends what kind of buffes have.

And if you think  you need to reset then you can be reset only for once for free reset.

After you need to give some dias to pay to reset. so it can be reset anytime just like that.

All here are defends on what buffes your charactor's got. its not too hard to pick anyway.