This is a union book idea

Yn ln has powers but they were quote evil power his life was difficult because his parents were heroes and his brother had the quote heroic power so Yn is going to prove them wrong Yn going to train his powers till he can't be match by hero,villain,headmaster,union students but there were people talking to bad about him thinking he'll be a villain no matter what Yn trains to learn his power

Yn power
Zenkai boost

Yn ki aura
Goku black ssj rose God ki/baby vegeta ki/majin vegeta ki

Yn techniques

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What Yn will look like

Yn transfomation

Union worlds
Mha
Rwby
High school dxd

For the ship or harem I don't know depends who wants this book

Hope someone makes previews of it in there story ideas that will be good enough for me