A few recurring themes in KHR that I thought were kinda interesting:
- Naming systems (Sawadas = Tokugawa shoguns, CEDEF = spices, ninth gen = sweets)
- Face multiples (Lambo/Romeo/Lampo, Hibari/Fon/Alaude, Ricardo/Xanxus, Cervello, first gen/tenth gen Vongola, Byakuran/Ghost)
- Tenth boss of a family (Enma = Simon Decimo, Tsuna = Vongola Decimo, Dino = Chiavarone Decimo, Uni = Giglio Nero Decimo)
- Two characters sharing the position of one guardian (Lal/Colonello, Mukuro/Chrome, Fran/Mammon)
- Villains turned allies (Mukuro, Xanxus, Byakuran, Simon, arguably Daemon Spade, arguably Bermuda)