As for the report, book after book is filled with notes on various inventions. Most are weapons or new ideas for artificial demons, all are suitably machiavellian. He's very passionate about his work, maybe you'd get along with him if he wasn't plainly Extremely Evil.

But there are quite a few of these dedicated to a particular study, the captured son of Sparda, trying to steal his skills and break his will enough to overtake his mind and body... The contents would be familiar to anyone who saw Vergil's memories. But he's never referred to by name, it hardly even treats him like a living being. When it does use a name, it's Nelo Angelo.