The Wuthering Waves Character Customizer is used to build characters for the analyzer. Edit and save your character traces, seqences, level, etc and test your teams after saving them (via local storage). The characters will have pre-set echos attached to them for the analyzer (which are considered near pefect echos). Use the "Edit Echos" button to customize the tool based on your own echos, or echos you would like to test (Eg: testing atk% vs damage bonus 3 costs) You can save up to 50 sets of echos by clicking "Save" once you've built an echo set.