I'm relatively new in the community and I was shocked how little Mandalorian content there is, perhaps i have yet to experience it. Regardless I propose 2 Mandalorian story's.
Light Side (with Republic) The player is a outcast Mandalorian that witnessed the raw power of the Sith and their allies to control worlds including Mandalore. On a quest to restore his/hers family Honor and status. The player will try to remove the occupying Sith, the battles will be costly and may end up in defeat. The player teams up with the Old Republic and the Jedi.
This character may not be the Tarre Vizsla, but could be the one who influenced Tarre Vizsla to join the Jedi Order.
That is all I have so far, I been inspired by the Mandalorian episodes in Rebels and thought is be cool to see some more of those planets, similar weapons, armor, and tech.
Please add you're input. I welcome anyone to add a Dark Side Story, and lets hope we get a chance to see this happen.