Can only have one costume active at once unless it says some like this (Magitek Exosuit only) -Note a costume is something that goes or changes a character's full look/gender or just covers the character's whole body.- Mind you this is just some of my favo

All of these weapons should fit in the game pretty well none of them are too overpowered in my opinion some of them are underpowered but still good for gameplay start to finish.