Laszlo in his gargoyle form. I went for a hierarchy sort of deal with their appearances, inspired by the Terror Dogs in Ghostbusters, wherein Vinz Clortho's horns were longer than Zuul's so they could be told apart. There, the in-universe reason (given in various books) is that Vinz has longer horns because he's male. Well, all of Katrina's servants are males, so, instead, the reason for Laszlo's horns being longer and more twisty than the other servants' is because he is the head of the domestic staff and thus, the lead gargoyle.