The Viper hero. My hero academia x male oc (stopped until season seven)

His name is Nagisa midoriya
Adopted as a baby by the midoriya family
He lives with his adopted brother and mum
His quirk is powerful but it scares people he also is able to hide his emotions scarily well when needed which makes surprise attacks a cinch but most of the time he's a cheerful but very introverted boy
During his complicated childhood, various things happen from wholesome to horrible let's get started
What will happen on his path to becoming one of the strongest heroes and helping his brother achieve his dream but will his hidden dark side get in the way or will a strong violet light help guide him out of the darkness