Registered records for North Supreme Kai before world filtering: death 1. Counts describe entries, not people or lifetime totals. Death sources include Chapter 508.
The filter uses the world where the event occurred, not the character’s origin. Distinct future branches remain separate entries.
In Supreme Kai’s recollection, he explicitly states that Kid Buu killed North Supreme Kai. This is kept separate from the absorption of South Supreme Kai and Grand Supreme Kai.