The greatest resource for discovering more about the character of Jesus is of course the Bible. But the stories we read there can also leave us wanting more.
First of all, because the reality of the New Testament is very different from ours. Nearly 2000 years later, it is very difficult to imagine a world where travel is done on foot or on the back of a donkey, where cell phones and the internet do not exist, where the climate is extremely different (I live in Montreal, Quebec). A society based on community (for the better or for the worse), far from the hyper-individualized Western World that I am familiar with. So there is a time, cultural (and meteorological!) barrier that separates me from the world in which Jesus evolved.
Secondly, because of the way things are told in the Gospels. Jesus spends a lot of time meeting people, but the accounts of these encounters are often very summarized: we read a few hours, a few days at best, often only a few minutes of the life of the person who meets Jesus...
These texts pique our curiosity. They can also leave us with many questions: where does this person come from? How did they get there? How did they feel at the time? What effect did this encounter have on the rest of their life?