Pure DP is actually one of the weakest and difficult builds for a charm, to be honest. If you're new to the game as a whole, I suggest following either a pure AP or a pure HV guide.

Fantasia
Miyuno (Witch), Akiya (Soul Master), Lunela (Primadonna)
Jewelia
Absence (Bunny), Arulia (Sheep), Riasu (Sheep)
Signature credit: aisoyoko