Who is Duncan Idaho from Chapterhouse: Dune and what is their importance?

Duncan Idaho is a Mentat ghola, returned to life countless times from the Tleilaxu axlotl tanks, Idaho has loyally served House Atreides and the Bene Gesserit since the time of Duke Leto I. His metaphor of facing mirrors and gathering images daily, viewing the infinite and finite, guides the Reverend Mother Superior Darwi Odrade, to whom he currently reports. Idaho refers to "Specialized complexity - gather, assemble, and reflect." Because his Atreides genetic shielding against prescience is not foolproof, Idaho lives imprisoned on a no-ship, living with the ex-Honored Matre Murbella, with whom he fathers four daughters.