I keep wondering if Minna is going to show us Lalli changing his behavior towards others as the time goes by, or if she is going to stick with the "catboy" behavior until the end. I mean, it could go both ways, since Lalli has so many quirks and manneirisms that would be quite difficult to get rid of, but, at the same time, this is the first time he is away from home and among so many strange people. This could make he go through some changes, perhaps turning him in a more sociable person.
Some old concept art that Minna posted showed Lalli and Emil working together, and Lalli was smiling, which I think demonstrates a changing of character for him. Or maybe that was before Minna had fully planned Lalli's personality?