Who or what does the main character of the movie "Leon The Professional" tenderly care about?

"Léon: The Professional" is a 1994 English-language French action-thriller film written and directed by Luc Besson. It stars Jean Reno and Gary Oldman, and features the film debut of Natalie Portman. The plot follows Léon (Reno), a professional hitman, who reluctantly takes in twelve-year-old Mathilda (Portman) after her family is murdered by corrupt Drug Enforcement Administration agent Norman Stansfield (Oldman). Léon and Mathilda form an unusual relationship, as she becomes his protégée and learns the hitman's trade.

Unlike other 1994 crime films "Leon: The Professional" is a fairly straightforward narrative with little overt symbolism or subtext. The symbols that do appear in the movie, however, provide the viewer with information about the inner workings of Leon and Mathilda.

The main and most obvious symbol in the movie is Leon’s beloved plant. Leon and Mathilda openly acknowledge that the plant is like Leon because it has no roots. The plant also represents Leon’s dynamic nature when Mathilda plants it in a field, thereby finally giving it roots and illustrating Leon’s attachment to another human being.