Luca is a very timid boy, tending to think very lowly of himself. Astronomy is really just a hobby, as far as he's concerned. However, he is the walking definition of a people pleaser, often causing himself some harm while working on things for other people, but due to stress tries to limit it by low amounts of interaction. However, there is a lot of internalized self-doubt: an internal voice always saying "Not enough", and id you say anything enough, you start to believe it.