What both amuses and frustrates me about Kakashi, and about a lot of the characters in Naruto, is that we can get all this detailed backstory about tragic historic events that shaped a person, but those events deal specifically with their history as a ninja and we still might know next-to-nothing about their day to day personal lives. This is the worst with Kakashi. The most significant two facts we know for sure about his adult life, on an individual personal level, are that 1) he grieves almost religiously, 2) he reads erotica.

What is his house like? What are his personal habits? What does he like or dislike? How is he with his peers as opposed to with the genin/chunin? All the scenes we see with him usually involve being a ninja. Either working, fighting, or teaching. And he's very closed off with the genin, too. We know way more about Naruto, Sakura, the other genins, than we do about Kakashi.