To change characters mid-game, players must collect bricks marked with specific elemental symbols. Playable Characters & Forms
Here is the tricky part. Because the game is old, it won't install normally. You must place the file manually.
While most content is unlocked through gameplay, some LEGO Ninjago titles (like the Movie Video Game ) use codes to skip the grind. For the Final Battle mobile game specifically, upgrades are usually tied to your stud count. Character/Ability Code (General LEGO) Kai (Training) Ninja Dual Sword Fire Spinjitzu Lloyd (Kendo) H7HGT3 Fast Build / Green Spinjitzu Nya (Ceremonial) 8755Q9 Ninja Spear Water Spinjitzu
If you want, I can: