Daiya

Daiya, often referred to as Diamond (ダイヤモンド)​, is one of Kyotaro's primary allies in Regional Crusaders. This is the original depiction of Daiya Rockefeller, as created by Alex Guy. She appears prominently in Stardust Frontier and Stardust Requiem.

Daiya is introduced as a beautiful and spoiled member of a rich family but learns that appearances aren't everything. She joins Russell Johnson, Kyotaro, and Hikaru to investigate claims of mysterious disappearances and mythical beings.

Final Endings
By this arc, Daiya and most of the previous protagonists have died of natural causes.