Dear Simon, London
I'll let Kyabje Trijang Dorje Chang have the last say.
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Likewise, in regard to this very Dharma protector, Emanated Gyalchen Dorje Shugden, in Expression of the Names of Manjusri, it says,
Glorious illuminator of all forms!
Holder of all reflections!
Thus, although he can appear in any mundane or supramundane form whatsoever depending upon whether our mind is pure or impure, in actuality he is Venerable Manjusri of nondual wisdom mandala that is the appearance of purified aggregates elements, and sources of consciousness, showing himself as a miraculously powerful worldly protector.
Wrong Assertions
Not understanding such important points, some, who have fallen under the influence of the demon of partisanship, think and say that this supreme deity, the great emanated Dharmapala, is no different than an ordinary gyalpo or tsen spirit who has an inferior form as a result of being a monk or lay person who died with bad karma. Leave aside relying upon him as a protector, they even deride others who do so. There are some, indeed, who echo such claims knowing nothing about it.
Yet all this talk is nothing but babbling speculation. Why? Because this great guardian of the teachings is well known to be the precious supreme emanation from Drepung monastery's upper house, Dragpa Gyaltsen, arising in a wrathful aspect.
The proof is unmistaken.
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from VAJRADHARA DORJE SHUGDEN, his nature, function and history, written by His Holiness the Dalai Lama's root Guru, Kyabje Trijang Dorje Chang.