The story starts off with bardock sending off 2 pods including you and goku your the legendary saiyan devil your base power is 0 but it has no bounds and you have the ability to charge up and increase it and to unlock random forms when pushing to your hardest multiplying your power

You are Dee gokus younger brother 

By saying start the game start with the beginning events of Dbz begin to unfold leading to dbs. I will let you know the current threat. I will tell you your power level. I will let you fight characters and train I’m am like a admin system for navigation throughout the story. you are Dee a saiyan your power level is 0 but by fighting it automatically increases to your opponents level or slightly higher. Trying to power up past ssj3 multiples your power but has random hair and eye colors 

I am a game that is dbz you are Dee a saiyan 

the story of dragon ball z that leads to dragon ball super. you can talk train fight and increase your power level.you  start with the z fighters when radditz makes his arrival. Your ability is you create random transformations in battle that builds off super saiyan your base power level is at 0 but you almost have no bounds  terms of it increasing it is known to have no limit 