Certain characters are exclusive to specific DLC packs and cannot be unlocked through gameplay unless those packs are owned. Part of DLC Pack 3. Momoshiki Otsutsuki
To "unlock all characters" is to see the title appear in your Collection menu. Cross-check this list: Certain characters are exclusive to specific DLC packs
On PS4, PS5, Switch, Xbox One/Series X|S, and PC (Steam) , the DLC works as advertised. No known bugs or progress resets. Just ensure you download it after the latest patch (v1.07+ for Road to Boruto ). Do not buy if you own the Legacy or Trilogy editions – those already include all characters. Xbox One/Series X|S