@RainGnyu I think getting the Ivlida units from the Buster badge shop and then upgrading them to Cleasis at Zig is the best investment right now for Hunters and most classes. Cleasis are both strong (i.e. better than union) and apparently can be upgraded into 13* Schevelle units later on.
However, if you got the back and arms Ofz set from Profound Darkness you could just wear the Cleasis legs as I believe Ofz will also have an upgrade later. Lastly, if you want to go glass cannon, I hear the dark falz 12* units from the Bewitched Woods are high in dmg + PP, but low in defense/hp. However, each unit only buffs one type of attack so you'd only wear the Melee one and use Cleasis for the other slots.
@Tekaru Sorry to hear you encountered a bug with your password. The only way I know to request a reset is by using this website and going to Support => Contact Us => Contact Us Now => Dropdown menu at top of the page => Submit a Request => dropdown option to request a password reset/2nd password. If you can sign into Steam to post on the forums it's surprising that you can't stay logged in here to also submit a support ticket. Maybe create a post in the Support, Bug Report section and tag one of the GMs in it?