Thread:Kitsune Tamamo no mae/@comment-28265227-20170521083006/@comment-27971189-20170830115323

Theory #1:

After Gudao visit to SE.RA.PH, Mooncell recorded his achievement of defeating Kiara. However, thanks to some unknown circumstances, someone use that records to create fusion Servant which is Charlemagne; surprisingly Charlemagne and Gudao personalities match good enough that they blended flawlessly.

Theory #2:

Gudao actually Charlemagne in disguise. Him, sleeping on corridor, is referencing Mr. Bean; implying Gudao is sent to Chaldea by through some extraterrestrial method that can only be explain by Mooncell.