There is an event on Lost Children that shows a picture of Biggles. It only comes up once in a while. It's the one where Biggles asks to inspect the lab, and you have two choices. I always picked the same choice and Biggles steals food. I chose the other choice recently and it said, "but wait, who is Biggles?" The picture of him looked to be a middle aged man and he worn the black outfit with the red belt. I didn't understand at that time who Biggles was because I had just started playing vv games. I only wish I had taken a screenshot of it.