The first thing is that Goku is passed Super and GT and AF so he will have all the forms he had in them and Goku, will be a teen in this story but he looks like kid but It will not affect his form or strain his body his base power level is 8,400,000,000 and that's because it said in Gt Goku base was super Saiyan 3 but it even higher then that in at because his base form was super Saiyan 4 when he fought omgea shenron so it more like 100,000,000,000,000 so we are going go with that.
Base form
The regular form of sayian and yes Goku has his tail in this story because I thought it was cool that it needed to get the form
Great ape
In this form, Goku power level is multiplied by 10 times Goku can control this form but can lose control if angry.
Kaioken
This is one move he learned from King Kai in other world. The move can be used in the base form and in super Saiyan and super Saiyan god and Saiyan blue and boost the power of the form he's in but depending on what form is how high he can go but it take a lot out of him and destroys his body if he not careful.
Super Saiyan
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The Strongest Of The Saiyans
Fanfictionwhat will happen when goku is sent to the highschool dxd world as kid find out what will happen when the world most powerful sayian arrives in this world can the world even survive the great power of his