Izuku yagi is neglected and abused but had a quirk that boosted his intelligence as izuku was sent to Tartarus by his parents but izuku didn't care he let karma get his revenge because he may look like an innocent person but his mind very powerful and very psychotic ideas/plans to ruin people's life's because of he couldn't have a nice life others shouldn't either
For the ship I don't know and this book is very dark who ever wants it
