I think one of the most fascinating aspects of Spy x Family is that despite being a shonen, where the cast in this genre usually features teenagers with some adults here and there due to being aimed at a teenage demographic, the franchiseās main characters and supporting cast is comprised of nearly every age group EXCEPT teenagers. You have the adults (eg. Loid, Yor, Franky, Fiona, etc), toddlers (eg. Anya, Damian, Becky, etc), and senior citizens (Henry and Martha).
Spy x Familyās characters consists of various age groups but thereās barely a teenager in sight and it isnāt limited to which age group gets to do stuff that matters either. Not that there's anything wrong with having teens as protagonists, but making the main protagonist a man possibly in his late 20s or early 30s and the main character group being two adults, a child, and a dog is quite refreshing and one of the reasons why these characters stand out so much.